The best advice I was given was to find a bunch of campgrounds at which I would be interested in staying, and then call and ask about size limitations at those campgrounds.
If the campgrounds where I know I'll want to stay can handle my preferred RV size in at least 40 percent of the sites, then I'm good. I'll find others where I can fit also.
If the campgrounds where I know I'll want to stay can't handle my preferred RV size or only have 1 or 2 sites that will, then I need to consider downsizing. Otherwise I'll likely find other desirable campgrounds where I can't fit.
Buy according to YOUR specific needs not everyone else's.
If I had bought a 27ft rig (which is a popular recommendation on this site), I would be very limited in staying at my favorite campground. They have 5 sites that would fit that length rig. With my smaller rig, I can fit in 41 of the 47 sites (the other 6 are tent only sites). That gives me a nice choice of sites - including my favorite which gives me a morning view of the fish jumping (no other site has that view).
So while someone else would have been perfectly fine with a 27ft rig and would say "I can camp there", for me, I want a choice of campsites not the "only one where I can fit".
