Totally aside from the weight questions....that's a LOT of trailer and finding sites is likely going to take some serious homework. It's not that a CG wouldn't have a site that's long enough, the trick is getting the 39' + your tow vehicle maneuvered around trees and such to get to the site in the first place. I see a potential for KOAs in your future without good planning. With 7 you're for sure going to want full hookups or you'll be dragging the blue tote 3x a day. As for staying off the interstates, unless there is another reason, I think interstates would be a benefit since you won't be dealing with small town streets and corners.
Suggest you check into an app, and I don't know the name of it - someone here likely will, but it gives you info on fuel stops and getting in and out easily. Some of the Pilot/Flying J/Love's are great if it weren't for the cars parked directly in front of the building. Getting in is one thing, getting out is another. This app is supposed to help you with that.
Sounds like a great trip! Is this a travel/home study experience??
