Agree too much for 2 weeks. Just do the northern parts.We stayed in Madison campground in Yellowstone. No hookups but centrally located. Yellowstone is as big as the state of Rhode Island so you will do a lot of driving. If you want full hookups, Fishing Bridge is the only campground in the park with hookups. Many people like Grizzly RV park which is in West Yellowstone if you want a private RV park. If you don't have reservations, you may have trouble finding a site especially on weekends.Somenice camopgrounds we stayed at on the way out or back were Long Horn ranch and RV park in Dubois,Wy. Waubonsie State park west of Nebraska City ,Iowa. $16 a night with electric. Olagalla recreation are in Nebraska.$22 with electric on a nice lake.