RV Rules Explained: The 3-3-3 Rule, 10-Year Rule, and More

• How to read the Big-Rig Score
• 9–10 Rolls right in
• 7–8.5 Comfortable
• 5–6.5 Workable, plan ahead
• 3–4.5 Tight
• 1–2.5 Not recommended

By Calvin Whitlock · Last updated June 11, 2026 · How we built this

TL;DR: Most "RV rules" you'll hear aren't laws — they're conventions and etiquette the community swears by because they keep you safe and welcome. The big three to know: the 3-3-3 rule (drive no more than 300 miles, get to camp by 3 p.m., stay at least 3 nights), the 10-year rule (some parks refuse rigs older than 10 years — a real policy, not a law, and negotiable), and the 80/20 rule (don't load tanks or weight past about 80% of capacity). None of these are enforced by a cop, but the 3-3-3 and 80/20 keep you out of a bad spot, and the 10-year rule keeps you from getting turned away at the gate. For a 40-foot-plus Big-Rig Friendly rig, most of them matter double — you've got more length to wrangle, more weight to manage, and fewer parks that'll take you on a bad day. Below, each rule in plain English: what it is, whether it's etiquette or policy, and how a big rig should handle it.

I've been living and driving a big rig full-time for years, and I'll tell you straight: I follow some of these religiously and treat others as a starting point. Here's the honest version of each.

How to read this: Unless I flag it as a law or a written policy, a "rule" here is a convention — something experienced RVers do because it works, not something you can be fined for breaking. Where a real legal or insurance point exists (the 10-year rule, occupancy, zoning), I say so and tell you it varies by park, state, or local ordinance — confirm before you count on it.

What is the 3-3-3 rule for RVs?

The 3-3-3 rule says: drive no more than 300 miles in a day, arrive at your campsite by 3 p.m., and stay at least 3 nights before moving on. It's the most-repeated rule in RVing, and it's pure convention — etiquette and self-preservation, not law. Nobody enforces it but you.

The logic holds up. Capping the day at 300 miles keeps you from white-knuckling it past your limit. Arriving by 3 p.m. means you set up in daylight, with the office still open if your site's wrong. And three nights minimum means you actually rest instead of spending your trip hitching and unhitching.

Why it matters double for a big rig: a 40-foot-plus rig is more tiring to drive — more wind, more lane management, more concentration per mile — so 300 miles in a big rig feels like 400 in a van. And arriving by 3 p.m. isn't just nice for a big rig, it's close to mandatory: backing a 45-footer into a tight site at dusk, tired, with a line of rigs waiting behind you, is how mirrors get clipped and tempers flare. I treat the 3 p.m. arrival as a hard rule for myself even though it isn't one for anybody else.

What is the 2-2-2 rule for RV camping?

The 2-2-2 rule is the conservative cousin of 3-3-3: drive no more than 200 miles, arrive by 2 p.m., and stay at least 2 nights. Some folks stretch it to "2-2-2-2" and add "keep the tank at least 2/8 (a quarter) full." Same idea, tighter margins.

It's the better starting point if you're new, if you're driving something big and unfamiliar, or if the route is mountainous. Two hundred miles is a genuinely relaxed day — you can sleep in, take the scenic detour, and still be parked with your feet up by mid-afternoon.

For a big rig, I'd reach for 2-2-2 over 3-3-3 on any day with real elevation, bad weather, or a destination I've never driven into. The shorter the day and the earlier the arrival, the more margin you've got when something goes sideways — and in a 45-footer, something usually does.

What is the 10-year rule on RVs?

The 10-year rule is a campground or RV-resort policy — not a law — under which some parks decline rigs more than 10 years old. You'll see it most at upscale, gated, or "resort"-class parks. The stated reason is aesthetics and upkeep: they want a uniform, well-maintained look and worry that older rigs may be run down. It is absolutely a real thing you can get turned away over, and it is absolutely not something any government enforces.

Here's the part the listicles leave out: the 10-year rule is almost always negotiable, and almost never actually about the calendar. Parks that have it will usually make an exception for a clean, well-kept rig — that's why they ask for photos. A spotless 14-year-old diesel pusher gets waved in over a beat-up 6-year-old all the time.

How big-rig owners deal with it: call ahead, ask directly whether they enforce a 10-year rule, and offer to email current photos. A well-maintained big rig is your best argument — and frankly, the kind of park that runs a 10-year rule is often the kind with the wide pull-through sites a big rig wants anyway, so it's worth the phone call. Don't assume you're banned; ask.

What is the 80/20 rule for RVs?

The 80/20 rule says don't load past about 80% of a limit — leave roughly 20% as a buffer. People apply it to a few things: don't fill fresh water, fuel, or holding tanks to the brim, and don't load your rig's weight past about 80% of its rated capacity. The point is margin — for water sloshing, for thermal expansion, for the stuff you'll inevitably add.

The weight version is the one I'd take most seriously, and it's the one that matters most for a big rig. Big rigs are heavy to start with, and it's easy to creep toward your GVWR (gross vehicle weight rating) once you load gear, water, and a full propane tank. Running near your weight ceiling stresses tires, brakes, and suspension — exactly the systems you don't want to fail at 60 mph in 30 feet of motorhome. Leaving ~20% headroom keeps you off the edge.

Treat 80/20 as a sensible guideline, not a precise spec. The hard numbers that do matter — your rig's GVWR, GCWR, and tire ratings — are on the placard in your rig and your tire sidewalls. Weigh your loaded rig at a truck scale (CAT scale) once and you'll know exactly where you stand instead of guessing at 80%.

What are the 7 C's of camping?

The "7 C's of camping" is a memory-aid checklist, not a rule with any official status — and the exact list varies depending on who you ask. It's the kind of thing a scout leader or a camping blog assembles to make planning stick. A common version runs: Camp (the site itself), Comfort, Cooking, Clothing, Communication, Caution (safety), and Conservation (leave no trace). You'll find other lists swapping in "Companions," "Compass," or "Common sense."

Don't overthink it. The value isn't the specific seven words — it's the prompt to think across categories before you roll out: where you're sleeping, how you'll stay comfortable and fed, what you'll wear, how you'll stay reachable, how you'll stay safe, and how you'll leave the place better than you found it.

For a big rig the same buckets apply, with the planning weighted toward "Camp" and "Caution" — because for us, the campsite has to physically fit the rig, and "caution" includes the maneuvering, clearance, and grade homework that a tent camper never has to do.

Can I sleep in a Walmart parking lot with my RV?

Often, yes — but it is not a guarantee, and it varies store by store. Walmart corporate has long permitted overnight RV parking, but each store manager makes the final call, and local ordinances can override the whole thing. Plenty of Supercenters welcome a one-night stay; plenty of others post "No Overnight Parking," usually because a city ordinance or past problems forced their hand.

The honest move is simple: call the specific store and ask the manager, then keep it clean — one night, nothing set up outside (no awning, no chairs, no leveling jacks, slides in if you can), park to the far perimeter away from cart corrals and light poles, and buy something inside. For a big rig, the perimeter matters extra: you want a spot you can pull through or swing out of without boxing yourself in.

For the full rundown on Walmart and the other realistic non-campground overnight options — truck stops, rest areas, casinos, Cracker Barrel, and more — each scored for big rigs, see our hub: Where Can You Park an RV Overnight?

What states have outlawed living in an RV?

No U.S. state has a clean, blanket law that "outlaws living in an RV" — this is a zoning and local-ordinance question, not a state-by-state ban list. Anyone who hands you a tidy list of states where it's illegal is oversimplifying.

What actually exists is a patchwork of local rules: many cities and counties prohibit living full-time in an RV parked on residential property or on the street, cap how many nights you can stay, or restrict RV occupancy to licensed campgrounds and RV parks. The same rig that's perfectly legal to live in at an RV park down the road may violate a zoning code if you park it in a friend's driveway and call it home. It comes down to the specific municipality, the zoning of the land, and how the local code defines a dwelling.

So the honest answer for a full-timer: it's almost never about the state line. Before you settle anywhere long-term, check that town or county's zoning and RV-occupancy ordinances — and assume the rules vary, and change. Related question RVers ask: does living in an RV count as being homeless? Legally and for benefits purposes that, too, depends on local definitions and the agency involved — there's no single national answer.

Quick answers RVers also ask

What's the average lifespan of an RV?

There's no single guaranteed number — but a commonly cited range is roughly 15 to 20 years or around 100,000 to 200,000 miles for a motorhome, with towables often lasting longer because they have no drivetrain. Treat those as ballpark figures, not a spec: real lifespan depends far more on maintenance, storage (covered vs. baking in the sun), water intrusion, and how hard the rig was used than on the calendar. A well-kept rig outlives a neglected newer one — which, not coincidentally, is exactly why the 10-year rule is more about condition than age.

How many people can you legally put in an RV?

The real limit is the number of seatbelts/seating positions for travel, and that's set by how the rig was manufactured — not by how many beds it has. While moving, everyone should be in a proper seatbelted seat; the number of berths (sleeping spots) is usually higher than the number of legal travel seats. Where it gets legally fuzzy is whether riders may be in the living area of a moving motorhome at all — that varies by state, and several states restrict or prohibit it. Check your rig's documented seating capacity and your state's law before loading up the family.

What RVs should you stay away from?

I won't name-and-shame specific brands — that's opinion dressed up as fact, and I don't fabricate. What I'll give you is the honest pattern to watch for: be cautious of any rig with signs of water damage (soft spots in floors or walls, stains, a musty smell), delamination on fiberglass exteriors, a salvage or flood title, sloppy or undocumented repairs, and units from a model year known for a specific recall you can't confirm was addressed. Water intrusion is the rig-killer. For a big rig especially, also verify the chassis and drivetrain service history. Buy on condition and documentation, not on brand reputation alone.

What is the most forgotten item when camping?

There's no audited "#1 forgotten item," but the answers that come up over and over are the dull, easy-to-overlook ones: a sewer hose (or the right adapters), leveling blocks, a drinking-water-safe hose, and — endlessly — the little stuff like a corkscrew, dish soap, or fresh batteries. For RVers, the most painful forgotten item is usually a connection adapter — a water pressure regulator, a 50-to-30-amp dogbone, or the right sewer fitting — because it's the thing that turns "set up and relax" into "drive back to town." Build a checklist once (this is where the 7 C's earn their keep) and stop relying on memory.

How we built this

This guide explains the "rules" RVers actually search for and frames each one honestly: which are community conventions and etiquette (the 3-3-3, 2-2-2, 80/20 rules and the 7 C's), which are park or insurer policies (the 10-year rule), and which touch real law (occupancy, zoning) that varies by jurisdiction. None of these is a statute you can be ticketed for breaking unless I've specifically said so, and where a legal or policy point exists I've framed it as varies / confirm before you count on it.

I write from years of full-time big-rig RVing — driving, parking, and living in a 40-foot-plus rig — so the big-rig angle on each rule is first-hand, not theory. I'm an RVer and the founder of this directory, not an engineer or a lawyer: where a number is a range or a policy varies, I've said so rather than inventing a precise figure. Research and drafting for this page were AI-assisted and reviewed by a human (me) before publishing. No business paid for placement in this guide, and nothing here was written to sell you a product.

Verification status (last reviewed June 11, 2026): The conventions above (3-3-3, 2-2-2, 80/20, 7 C's) are described as the RV community uses them; the 10-year rule is described as a park policy, not a law; the Walmart, occupancy, and RV-living points are framed as varying by store, state, and local ordinance because they do, and they change without notice. Lifespan, forgotten-item, and "RVs to avoid" answers are given as ranges and patterns, not audited statistics — no fabricated figures appear on this page.

Frequently asked questions

What is the 3-3-3 rule for RVs?

The 3-3-3 rule is a driving convention, not a law: drive no more than 300 miles in a day, arrive at camp by 3 p.m., and stay at least 3 nights before moving on. It keeps you from over-driving, lets you set up in daylight, and gives you real rest. For a big rig it matters double — a 40-foot-plus rig is more tiring to drive and far harder to back into a tight site at dusk, so the 3 p.m. arrival is close to mandatory.

What is the 2-2-2 rule for RV camping?

The 2-2-2 rule is the conservative version of 3-3-3: drive no more than 200 miles, arrive by 2 p.m., and stay at least 2 nights (some add "keep the tank at least a quarter full"). It's the better starting point for new RVers, big or unfamiliar rigs, and mountainous routes, because the shorter day and earlier arrival leave more margin when something goes wrong.

What is the 10-year rule on RVs?

The 10-year rule is a campground or RV-resort policy — not a law — under which some upscale parks decline rigs more than 10 years old, mainly for appearance and upkeep reasons. It's almost always negotiable: parks routinely make exceptions for clean, well-kept rigs, which is why they ask for photos. Call ahead, ask directly, and offer current photos; a well-maintained big rig is your best argument.

What is the 80/20 rule for RVs?

The 80/20 rule says don't load past about 80% of a limit, leaving roughly 20% as a buffer — applied to fresh water, fuel, and holding tanks, and most importantly to weight. For a heavy big rig, staying about 20% under your rated weight capacity protects tires, brakes, and suspension. Treat it as a guideline; the hard numbers that matter are your rig's GVWR and tire ratings, confirmed at a truck scale.

What are the 7 C's of camping?

The 7 C's of camping are a memory-aid checklist, not an official rule, and the exact list varies — a common version is Camp, Comfort, Cooking, Clothing, Communication, Caution, and Conservation. The value isn't the specific words but the prompt to plan across categories: where you'll sleep, how you'll stay comfortable, fed, reachable, and safe, and how you'll leave no trace.

Can I sleep in a Walmart parking lot with my RV?

Often yes, but it's not guaranteed and varies store by store: Walmart corporate permits overnight RV parking, but each manager decides and local ordinances can override it. Call the specific store and ask the manager, keep it to one night with nothing set up outside, park to the far perimeter, and buy something inside. See our overnight-parking hub for the full list of big-rig-scored options.

What states have outlawed living in an RV?

No state has a clean blanket ban on living in an RV — it's a local zoning and ordinance question, not a state-by-state list. Many cities and counties prohibit full-time RV living on residential property or the street, cap overnight stays, or restrict RV occupancy to licensed campgrounds. The same rig that's legal at an RV park may violate a zoning code in a driveway, so check the specific municipality's rules, which vary and change.

What's the average lifespan of an RV?

There's no single guaranteed figure, but a commonly cited range is roughly 15 to 20 years or about 100,000 to 200,000 miles for a motorhome, with towables often lasting longer. Treat it as a ballpark: maintenance, storage, and water intrusion matter far more than age — a well-kept rig outlives a neglected newer one.

How many people can you legally put in an RV?

The real limit while driving is the number of seatbelted seating positions the rig was built with, not the number of beds. Berths usually outnumber legal travel seats. Whether passengers may ride in the living area of a moving motorhome at all varies by state, with several restricting or prohibiting it — check your rig's documented seating capacity and your state's law.

What RVs should you stay away from?

Rather than name brands (that's opinion, not fact), watch for condition red flags: water damage (soft floors, stains, musty smell), fiberglass delamination, a salvage or flood title, undocumented repairs, and unaddressed recalls. Water intrusion is the rig-killer. For a big rig, also verify chassis and drivetrain service history. Buy on condition and documentation, not brand reputation alone.

What is the most forgotten item when camping?

There's no audited "#1," but the repeat offenders are dull essentials: a sewer hose and adapters, leveling blocks, a drinking-water-safe hose, and small items like dish soap or batteries. For RVers the most painful is usually a connection adapter — a water pressure regulator, a 50-to-30-amp dogbone, or the right sewer fitting — because it sends you back to town. Build a checklist once and stop relying on memory.

Compare across the directory: What "Big-Rig Friendly" means (the standard behind every score) · Big-Rig Glossary (every term defined) · Where Can You Park an RV Overnight? (the overnight rules in depth) · Big-Rig Friendly Campgrounds in Florida (when you want a real campsite). The conventions here pair with the campground and overnight pages — the rules tell you how to travel; those pages tell you where a big rig fits.

[ Submit a correction → ]   Disagree with how I've framed a rule, or know a park that enforces (or waives) the 10-year rule? Tell me and I'll update the guide.