Let’s talk about America’s most popular subject: width. Vertically-challenged pop-ups, scrawny teardrops, fluffy Class C’s, willowy Class B’s, behemoth Class A’s, big-boned 5th wheels and dad-bod travel trailers. All of ’em. There are no “bad” RV body types. But there’s also no such thing as a one-size-fits-all RV.