There are a lot of side roads where you can boondock and Forest Service campgrounds at Lake Irwin and Lost Lake. Both of those campgrounds can take RVs up to about 30' and Lost Lake has some equestrian sites that are 60' long. If 60' long horse trailer/tow vehicle combinations can travel that road, you certainly can.
Your only problems may be that the water is turned off and it is aspen viewing season. The Kebler Pass road is one of the 3 or 4 most popular leaf-peeping roads in the state because it passes through aspen groves for at least half its length. There are sometimes traffic jams on it during September weekends caused by the families trying to view the aspen. Even my wife has taken several hundred aspen photos along that road, but we always go in mid-week.
So, good luck finding a vacant campsite along there.
