This is a benchmark thread on Yellowstone for Truck Campers. I noticed that many of the trailer people go to one spot and drive their TV around to see the sites. Since TC'ers are all in one piece, we just drive our little mollusks around to see the sights, since we can. We've been to Yellowstone in about '04 during a rather dry year with an early spring, so arriving there the first week of June worked out fine: before the crowds and the mosquitos. But this timeline is variable as to the way the season worked out, pricip-wise. If you are flexible, that would be a good thing.
We stayed at Henry Lake, a minimal state? campground off Hwy. 20 near the west entrance. Pretty stark, but a good jumping off place that's not in the park.
We also camped at the most minimal campground in Y-stone: Slough Creek up a dirt road to accoutrement-free campsites figuring the TT and MoHo folks would not try that. Not so, trailer breath. A lot of people had the same idea: who would attempt this pulling a trailer? A lot of folks, that's who. We also stayed at Bridge Bay after choking on the prices per stay, and the snooty, "Is THAT your coach?" attitude at Fishing Bridge.
We were in the park only 3 or 4 days and only scratched the surface.
As has been previously said, we way underestimated how big this place is and how many days it takes to see everything. Following this we went south to the Grand Tetons and stayed across the valley up high with a nice view of the Tets.
My only advice is to get there on the edge of the seasons and....
get there and enjoy the place BEFORE IT BLOWS!
jefe