What I think really comes into play is the turning radius of a coach. I've traveled thru a couple of camp grounds in my 32 foot coach that making the various twists and turns to my assigned camp site in something with a longer wheel base might have been difficult if even possible.
Each CG is going to be different. You may lock yourself out of some camp grounds but I suspect the number is much smaller than you may think. Good luck with you future plans and full timing. There are may full timers on this site in 40+ rigs with personal web sites you can log into to see the various parks they stay are to give you some idea of you potential camp grounds choices.