Just did parts of the CO BDR in July. Spent about a month in the high elevation passes along the Continental Divide as well as Silverton/Ouray area.
The summer season is very short and accommodations are very expensive. Camping takes the edge of the cost.
I've done a couple of BDRs now and unless you are hell-bent on traveling border-to-border north-to-south (or vice versa), it's actually better riding picking out passes and trails you want to hit and focus on that. For example, the COBDR covers Cinnamon Pass, but misses out on Engineer Pass directly north of it:
If you are trailering to do a BDR, then you will have to do a loop back to the originating border again. That's not the end of the world, but I find it better to trailer to a central area (like Telluride or Ouray), set up a homebase and do passes and trails in that area sans luggage. Then pack up and move on and set up a different homebase elsewhere in the state. YMMV.
For trails/passes, my recommendation is pick off this list instead:
Discover high alpine Jeep and ATV trails near Silverton & Ouray, Colorado. All trails have maps, photos and GPS - gpx tracks.
www.jeeptheusa.com
Has trail ratings for difficulty level. Pick 2.5 or above for max fun!
Some must-dos: Engineer, Cinnamon, Ophir, Yankee Boy, Imogene, Black Bear.