Shearwater wrote:
I can't give you a direct answer on that but a lot of the NP campgrounds were built a long time ago and cannot handle vehicles of that size either because the campsites are too small or the roads leading to the sites are inadequate.
I would suggest googling the National Parks you are interested in and checking our what they have to say about size limitations.
x2
Parks we visit such as Big Bend have limitations due to older construction. For example, our 24-foot rig is a challenge to get into campgrounds at Natural Bridges in Utah, Navajo National Monument in Arizona, Desert View CG at the Grand Canyon and in Big Bend's Chisos Basin CG. On the other hand, there are several sites that can accommodate a 40-foot rig in Squaw Flat Campground in Canyonlands National Park. Be aware, too, that many parks' sites are first-come, first-served, and the bigger sites are often the first to go.