This unit has a real mix of country. Peaks of 14K in the southern part and then in the north the country is a lot lower toward Gunnison. the only problem is most of the lower part is private & reservation. A lot depends on the weather. Get a good map (BLM, etc) and look over the areas that are private. There are quite a few roads, again depends on the weather. I would want a good 4x4 truck. Lake City is a good place to start. East of there is a lot of NF land and good country. If you get a chance to do any scouting I would really look over the SE part of the unit. I havn't looked at the southern boundry close enough to know for sure, but I think Creede is about the southern edge. Another good place to stay and scout from.
Hope this helps some. I spend a lot of time 4 wheeling between Lake City and Silverton every summer...awsome country.