Many state parks all over the country have very limited sites available for an RV over 35'. That's because so many of them were designed when few of the larger RVs were common. Most federal parks we have checked have the same problem. Many privately owned RV park that we have been in over the past 40 years we have been on the road have less than 50% of sites that could accommodate larger rigs - and too often these are occupied by smaller RVs because the owners want more room.(Rarely will a CG have rules restricting how small an RV can be to use particular sites, they just charge more for the larger ones). Same reason, although many private CGs are trying to increase their availability. We own a 32' MH and almost always have our toad attached. It is unusual when we do not have to unhitch to fit, even in pull thru sites. The previous post also mentioned interior roads too tight for larger rigs. We often have this problem. Forget about turning around! Unless the need for a larger rig is imperative, Don't think we would ever be much bigger than we are now. Too many times we just wouldn't be able to fit.