If you want to see what is NEEDED vs WANTED take a look at the size of what is available in Europe. I don't think the humans there are any smaller than N America. My 34 would be a monster & not fit into sites over there.
We have been in every state at least twice. Even with our size we have been turned away a couple of times. We have been in many SPs with a supposedly 30' limit. That 30' is usually pad length so we hang off the back, sometimes not able to use the stabilizers. Big deal! At many of these SPs & NPs it is very obvious that at our length we are pushing the limits & a foot or so more would be past the breaking point.
Size does matter & past 30' the site availiblity starts to drop off. Past 35' it begins to go into freefall. By 40' in many SPs around the country sites are about non existent.
States with newer SPs or COE CGs are exceptions.
If you are big, travel without reservations & like SPs & NPs you had better learn to arrive mid afternoon or on a Thusday otherwise you may find that the only site long enough to accommodate you is occupied by a class B.