My wife and I are planning on extended traveling beginning next summer. We are now looking at used (5 years old) 40 foot diesel pushers. We have discounted National Park passes and discounted California passes. My question is - how much does a 40 foot RV limit access to camping sites versus our 30 foot class C (w/o slides) which we now own. We are not uncomfortable boon-docking, but would occasionally enjoy a stay with amenities, and we feel that we will need a larger rig if we are going to stay on the road