I take my crawler to Moab 3 to 5 times a year. I think Pritchett would be a nightmare on a UTV. It will probably make it, but not any fun. There are much better trails to run and enjoy than bash your ride trying to get through. You paid a lot money for that thing, enjoy it, don't destroy it. Of course if your wallet is big enough, then have fun. I would not even consider taking my RZR on that trail and I have run it probably 20 times over the years starting in 2001. This past year was the most difficult it has ever been. If you do break, there is no easy way out. You have have to go down everything you went up. Going down in a RZR may not be to bad, but your buddy in the 4Runner won't like it.
Post a damage report when you get back, not to prove my point. Just because I would actually like to know. Also let us know what other trails you hit and enjoyed. I will be taking my RZR in May.
Watch some of the youtube videos of the folks on UTV's. It is to much work to enjoy.
Also make sure you have at least 2 or 3 other well built rigs to help your buddy out if he gets in a bad spot. You will want a winch, there are not many places for him to get turned around to winch you up. At the minimum, bring a snatch block. There are winch points on most of the hard obstacles.
My group broke a rear pinion and rolled 2 rigs last time we did it a few weeks ago.
This is from Pritchett on Sept 5 2012. This obstacle does not have a bypass. Those are 36" tires for reference of the ledge height.