yellowstone in May
Just stumbled on your note, Chelse. I've been there four times. I tend to be a camper, i.e., I prefer high, rough campgrounds with few amenities and I dry camp a lot so I may not be the best source for you. But I can give you a little info, I would follow up and confirm it. I believe the only campgrounds with full hookups are Fishing Bridge in Yellowstone and Colter Bay in Teton. It's very likely you will need reservations in either park. Colter Village CG is small with a lot of trees and it had a lot of big rigs in it. Some of the nicest CG's in Yellowstone are in the northeast part of the park. About the only place you may see bear are near Tower or W. Yellowstone. Union Creek is mostly tent, I think. I liked Gros Ventre in Teton, but I don't think it has hookups and Signal Mountain isn't suitable for big rigs. I don't think you will have any trouble from any direction except don't even think about taking that rig over Teton pass on the west side. My rule of thumb is always carry winter gear when traveling the high country and it's paid off. I've been snowed on in both Yellowstone and Crater Lake in July. Sounds like a great trip, enjoy.