We've traveled in the west via RV...it's the best way to see the "big" west including the national parks. We owned but rentals are popular via Denver or Salt Lake. I'd start with a few user forums similar to this site.
RV.Net RV and Camping Forum ? RV, Trailer, Camper, Motorhome, Camping and Campground Information
iRV2 Forum | - RV Forum Community and RV News
Good site to plan where to stay:
RV Park Reviews :: Home
Tons of blogs out there of folks doing all sorts of RV travels this is one of my favorites...young couple traveling full-time in an RV. They visit a lot of interesting places.
Gone With the Wynns
Happy travels.