Calvin Whitlock is the founder and lead reviewer at USA RV Directory and the creator of The Big-Rig Standard™.

A full-time big-rig RVer in a 40-foot-plus Class A, Calvin kept pulling into campgrounds advertised as “big-rig friendly” that physically weren’t. So he stopped guessing and built a fix: a uniform 1–10 score that rates every campground, restaurant, fuel stop, and route segment on the same criteria (length, pull-through, approach and turn radius, low clearance, fuel access, grade, and overnight rules).

He writes and scores the directory’s campground, restaurant, and route guides.

Editorial note: USA RV Directory listings are compiled from published specifications and public mapping data, AI-assisted for research and drafting and human-reviewed before publication. No business pays for placement or for its Big-Rig Score.