Ran the Rim Rocker trail last week (East to West). Wife, 14yr old son + one of his friends, and our Boston on board.
Arrived in Montrose CO late Wed night, camped near the trail head and then toured the trail for the next 2 days. We cut into the La Sals instead of completing the last section of the Rim Rocker as it was hot in the desert and we wanted to stay up high (cool) and in the forest. Still ~150mi of dirt/trail before dropping into Moab.
The first 40+mi are gravel roads, then it gets much more trail-like after Nucla. No problems for the van, but some puckering moments as the trail has some exposed shelf switch-backs (notably on the decent to Hwy 141, which you take for 1-2 miles before hitting more trails).
We also had even more puckering moments on a shelf road at the north end of Paradox Valley. This would have been a very easy section, but it had rained a bit and the silt turned ice-like and the van wanted to skate sideways on off-camber sections. We had a front tire dangerously close to a 20+' drop, but ended up getting out of that with sand ladders and littering the road with 2-4" rocks (to provide traction).
Awesome scenery, and we saw no one for much of the trail. All on our own!
Gotta find shade for lunch