Last year we started our visit to these places from Salt Lake City. Took US 89 from I-15 at Brigham City. On the way, in Montpelier, ID is a really neat place to visit, the Oregon Trail Center
. Would advise calling ahead for tour reservations. There is lots of RV parking.
Stayed at The Virginian RV Resort
in Jackson, WY.
At Yellowstone, you probably could find a spot in the Fishing Bridge CG, but lots of people rave about Grizzly RV Park
in West Yellowstone.
From West Yellowstone we used US 287, I-90, US 93 and US 2 to West Glacier. Stayed at W. Glacier KOA which was very nice and close to the NP entrance. Plan for a full day when you do the Going to the Sun highway. You'll want to make many stops to enjoy the sights!
Enjoy your trip!
'14 Winnebago Vista 35F, '14 GMC Terrain
BlueOx Towing Pkg, SMI Stay-n-Play
49 States & 7 Provinces visited in MH | WIT W112365