The two closest areas to you will probably be Rainbow Falls and the 700 Trails. I don't know of any campgrounds you can ride out of though. The campgrounds on 67 don't connect directly to the trails. The Rainbow falls area has some dry camping but with your rig it would be tough to get a spot. Also the 700 trails have a trail head out of Divide that has some boon docking spots. There are not that many of them though and turnaround with your rig would be challenging if you cannot find a spot. I have nearly the same rig.
Now for the good news. The riding at both of those areas is outstanding. The 700 trails are some of the best in Colorado in my opionion. If your in a sxs you will need to stay on the 300 series trails in the area as all the 700 series are 50 inch limited.
My reccomendation:
The best place to go for starters is the Taryall area just east of the town of Lake George.
Take HWY 24 out of Woodland Park, through Divide and then Lake George, and keep on going past Round Mountain campground. Keep going and look for St. Rt. 31 on your right. Grid for the turnoff is: 39.031769, -105.447001. Then go a couple miles and just after the first cattle guard look for rds on the right or left and camp anywhere you like.
There are lots of large easy to access spots in that area. Here is a good one: 39.047236, -105.452231. There are lots of SXS and ATV trails from that area.
Please make sure you have the MUVM maps for the area since there has been a lot of new folks making their own trails in these areas. Colorado is more anti OHV then Arizona is so closure of areas are a real concern.
Here is the link for the 700 trails and Rainbow falls.
http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5177645.pdf
Here is the link to the Taryall/Round Mountain area map.
http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5177650.pdf
There are a lot of other great riding areas in Colorado. Taylor Park has been mentioned is Def worth checking out but that is a July to early Sept trip. Sooner or later and a lot of the trails will be closed due to snow.
One last request. Please consider joining COHVCO to help keep trails open in Colorado. http://www.cohvco.org/
PM me if your looking for more info and i would be happy to share what I know.
Moab is another great place to go. We are heading there over spring break. V/R Ty
