I-80 in WY is pretty high at over 7800 feet. We stayed at the AB Campground in Cheyenne WY where the altitude was 8640 feet. The campground itself was ok, pretty level but it had a great BBQ restaurant which we ordered and they delivered to our RV. The motorhome on one side had a significant blow out; the damage was quite severe. Another reason to quit. The family in that motorhome consisted of mom, dad, 3 kids, 2 dogs and a rabbit.