I haven't run into the problem. Most places I'm just passing through I don't mind anything I'll fit-I'll let them assign it. I do round up a foot on the length and possibly two if I have a bike carrier. Scenic state/federal campsites I've generally chosen the site first come first served. I'll try for the smallest one which is desirable to me (views, location, level, etc). I'd probably avoid RV parks which assigned clearly inferior spots to smaller rigs (such as junkier denser areas of the park).