Where to camp in Yellowstone July 2016

This summer we stayed at Fishing Bridge RV park, yes, it is hard sided trailers only. Grizzly bears frequent the park. It is nicely located as you are basically on the main loop of the park, it worked well for us. It also worked well as it was on the road heading east when the time came to go back home. I wouldn't want to drive too far thru the park on the morning I was leaving as traffic is very unpredictable in the park, especially if there is a Bison jam.