Camping with longer trailers takes a little bit of effort to find campsites, but we've never had any problems getting into any campground we've wanted to stay at... none! It just takes a little more thought when looking and making reservations.
We went from an 18 foot, to a 31 foot, to 35 foot, and we noticed nothing different. Actually, parking the longer camper is easier because we select longer campsites now, and we select campsites that are not so tight with trees. Even the smaller trailer was challenging to get between trees. So if you automatically look for more open sites, you never have an issue.
About towing ... no difference going from 31 to 35 feet ... none! You will want a weight distribution hitch system with the longer trailer though. It's not an option, it's a must!
