I kind of have a general question about trail ratings & what kind of a rig you can get through them on. The most difficult ones I have done have been ~3.5s (Rattlesnake, Kane Creek...). What kinds of clearance (tire size), lockers, winch, etc should be expected to complete 3, 3.5, 4, 4+...? I do ok with 33" tires & lockers (no winch) on 3.5 trails, should I try any 4s in Moab this spring? What would it generally take to do 4+ trails like Pritchett or Golden Spike?