My husband and I want to take our class B motorhome from North Florida to Yellowstone and back. this summer. We don't have much time - 2 weeks tops. I'd love to go to Carlsbad Caverns and maybe Rocky Mtn National Park, turning around to head back at Yellowstone. We've been to the Grand Canyon (both rims), Zion and Bryce Canyon, as well as Yellowstone last summer, but want to return this time in rv. Is this possible?