WE live near Reading,Pa.Last May we went to Yellowstone in May. Great trip. Here are a few recommendations.Buckeye Lake State park in Ohio is nice. $26 for electric hookups. They have a big lake with a separate beach for campers. We took I-70 to I-74 then RT 36 across Missouri. This is in my opinion a better road than I-70 through Missouri.It is 4 lane,64mph. And there are 2 nice Missouri State Parks ( Long Branch and Pershing )along this route.We stayed at Pershing. $19 a night with electric and it's right off the highway. We then took I-29 north and then took a shortcut,Nebraska Rt 6 to I-80. We stayed at Olagalla Recreation Area. It's about 12 miles north but a beautiful campground on a lake. $18 a night plus $5 entrance fee.But there are other State Rec areas off I-80 that are closer. In Nebraska,we stopped at Minden to see the Harold Warp Pioneer Museum. If you like history,old cars,trucks,motorcycles,snowmobiles or tractors,you'll love this place. There is a campground at the museum.If you stay overnight you get one free pass to the museum.In Yellowstone,we stayed at Madison campground. It doesn't have hookups but is centrally located. In Yellowstone,go into the Inn at Old Faithful. The lobby is beautiful and the restaurant is very good and the prices are reasonable. Either going to,or leaving Yellowstone, there is a nice campground in Dubois,the Longhorn Motel and RV Park. Full hookups sites along the wind river. $49 a night. The bathrooms were like in your own home. Each one had a toilet,vanity and shower.