I'm looking to buy an 18.5' Dodge Xplorer. I understand that such a vehicle could camp in most ordinary campsites. I'm planning a long trip mainly visiting national parks winter months. I want to be able to stay at regular campsites in the parks and not have to go looking for RV sites. Can anyone tell me what the regulations are about what restrictions might apply to using RVs on national park camps. (I'm obviously not thinking about the ones that only a back packer can get to) Any feedback about my choice of van would be appreciated. Â£10000 for 1989 van with 125000 miles on the clock. I'm new here and I've not been able to find any guide price/blue book information.