National Parks and Trailer Length - What do you recommend?

Veebyes wrote:
Size does matter but also the ability of the driver & the quality of the spotter which is almost always the DW. A DW sitting in the passenger seat holding the poofy dog is useless & severely limits campsite options.

A good spotter is certainly a big help, but it's entirely possible to get into any campsite with no spotter...although it may take getting out and looking a few (or more than a few) times. If that were not the case, people like me (who commonly travel alone) would be in quite a bit of trouble.