The first two years I went to Moab I was completely stock and did just fine. Like others have said, just pick an easier trail and take it easy. Heck, even on some of the more difficult trails there are usually by-passes to the really hard stuff. I've seen a couple of VX's out there on nearly bald tire and they did just fine.
We usually get a little convoy together on the Sunday (or is it the Monday) before the meet starts. As people come across the country from the East they pick up other VX's and by the time they get here to Colorado there are usually quite a few VX's cruising down the interstate behind each other. VERY cool sight.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless