I did Swamp with my 4Runner in a couple hours, was told it was at least a day trip if not 2. Couldn't figure out what they were talking about. It was myself and one of my club members with a Sammi, we did get lost going back so maybe that's what they were referring to. The only obstacle that had any issues for me was climbing that steep granite slab, it drops down quickly then almost straight up. My front wheels were constantly trying to get behind my rears, kept sliding sideways on me but I did have lockers f/r and an auto trans, but we still didn't see what all the fuss was about.
Your subject line scared me, thought there were some requirements put in place by the forest service, my club will be based out of Dinky Creek the end of July, beginning of August to run those trails.