Slick Rock has gotten much more difficult over the last 5-10 years. Your rigs should be capable of the trail, but it definitely takes some offroading experience to avoid damage. I agree with the above suggestion to run Corral Hollow (specifically the eastern section) first, Slick Rock is significantly more difficult than that.
If you do run Slick Rock I suggest heading in from the southern end near Utica Resevoir. There are some nice camp sites after you cross the bridge over the river, and the most difficult obstacles are shortly after that. The first obstacle is a large step at the end of the campsite, keep walking about 5 minutes past that and you'll come across a steep and rocky downhill section. This is usually the most difficult part of the trail for most rigs.
More pictures...
Ooops.. plus his bumper cover fell off on the first step and he tore one of the welds on a rock slider.