Looks very fun! From searching, it looks like it would have to be done in very small groups (one or two cars), since it sounds like it may cause locals to get a little riled up.
One of the posts online mentioned trying not to alert the cops, though I'm not sure if it is illegal or not. If it is still federal land, then it would be federal trespassing, but its hard to say.
Might be something to look into is all. Still, sounds very fun!
Slavin, looks like it is east of denver in the town of Deer Trail.
Baby Beast 2- 1999 4Runner SR5
Baby Beast -1987 4Runner SR5-Gone, but not forgotten