Sorry I couldn't respond sooner, but I wanted to thank everyone for their great advice. (I was stuck out in the Gulf of Mexico) My CJ has done great in South LA and NWFL, but I was worried about CO. There are a few upgrades that I need, but I'm not as worried that I'll need a full rebuild. (SOA, D44, lockers, TBI, etc) But I think those can be done over time and as needed ... or better yet as funded.
I took the CO maps and went over them with my buddy. Mostly they've done 3-4 rated trails, they have done trails rated in 5-6 but that's not the norm. Plus they usually branch out each day from a base camp, so if there is a trail I can't make, it's just one of many in the area.
Thanks again for all the help. Your advice was great. I'm saving everything on this thread.