He'll be fine. There's bypasses for the obstacles. The only issue would be the water. We had a few that came to the rock rails on a stock Rubicon. Might want to have a to strap just in case he high sides.
Starting at the general store, trail 2 to G1 to 50 to 53 to G55 to 61 to 62 to 66, arrive at The Flats. Leaving, we went 66 to 62 to G54 to G60 and out on the top side. Rode the blacktop back to the camp.
Like I said, this trip took ALL day. With it getting dark earlier, it probably wouldn't be a bad idea to start around 7:00 am to ensure you get to the top and it's still daylight.
Feel free to take a look at the pictures in the below thread from our ride. Frogmech, bonedaddy, Gui, epetry, MattMC, and myself were all on the ride I just discussed.
http://wayalife.com/showthread.php?t=29714