Believe it or not, as long as you are able to control your right foot. A stock Raptor would be able to handle Texana Ranch. Now, the faster you want to go the $ goes up exponentially!
-Greg
All 4 of us at the front of the pack last year in the "A" class were running stock trucks. The smart ones had at least moved to mid-perch. I got a last-minute work reprieve and showed up completely stock - on bottom perch. However I did have a cheapo $100 SDHQ frame kit which was marginal at best. That course is an unreal hill country pounding that you can't even begin to imagine until you have run it at speed. Of course the power of life and death is in your right foot - both gas and brake. BUT unless you are planning on pussyfooting/sightseeing in the "C" class I highly recommend the following (because just ONE mistake will net you broken shocks, bent frame or both):
1). Mid Perch (or wear a kidney belt for support and just go ahead and order your new skid plate now haha)
2). Frame reinforcement kit (RPG is the most popular, because it is effective and you can get National leafs to eliminate the wheel hop as an economical package deal - Stage 3)
3). GPS - so course hazards are clearly marked and gives the ability to make your own additions according to your comfort level and truck mods. There are a crazy number of hazards out there that could kill your truck, and many of the course markers get knocked down over the three day run.
Highly suggested: read the "TRR Takeaways" thread - posted immediately after last year's run - will give fresh insight into the fun yet crazy experience that many of us had out there.
If you want to make an appearance at TRR with the intent of just partaking of the whole experience, and can truly control yourself to creep around the course... none of this applies to you!