My buddy who was living in a Airstream that was about 30' long and towed with a then new 1979 E-350 van installed a hitch on the front end. This allows him to back the trailer into really tight places with the front hitch. He later upgraded to a 34' Airstream. He could fit that trailer into almost anyplace.
The problem is many state parks where designed in the 30's and 40's, with a few designed in the 50's and 60's. Back then, it was normal to have a 7' wide trailer that is 18 - 24 feet long. Thus many sites are sized for that 'large' of a camper. Fewer sites are made for the 40' long trailers, and sometimes there is limited space across the road for backing in a larger trailer.
Many private campgrounds also put the campsites close together so that wiring costs are not excessive. Imagine the price of large wire - about $2 per foot, and you need 2-3 of them to each campsite. So if your campground is 500' across, or 750 feet across, the larger it is the much more expensive it is to build.
Anyway I was thinking that a 42' towhauler would be a great RV. Yet now I am re-thinking that a shorter RV that is easy to maneuver would be better, as I could park it in a National Park. If I only visit dry camping sites, and mostly off road recreation areas, they have a fairly large area to park, and no problem for a 42' trailer and 20' long truck.
Good luck!
Fred.
