Couldn't be closer to Yellowstone! Inexpensive and comfy spot to lay your head.
There is a huge variety in site sizes. We got in on a Tuesday at 4:00 and there were two spots left so I wouldn't hang your vacation on it unless you are traveling in the shoulder season.
Road from Gardiner is a well maintained gravel roadn it is somewhat windy and steep but passable by just about any vehicle. No reception.