Just wanted to put up a quick review for the Sherpa Crestone rack because they don't seem to get much airtime on the forums and it seems to be a really nice product. Sherpa seems to be a pretty young company but these guys have made an excellent rack. The fit, the way it attaches to the truck and the look are all spot on. It took almost exactly 5 weeks to ship from when I ordered.
They provide rubber feet and bonded rubber washers for the stock attachment points, which should provide a great long-term solution to weather proofing without the need for silicone, etc.
Instructions are good, with a few points that could need clarification:
1. The taller mounting feet go in the back
2. The bonded washers go rubber side down (I hope!)
3. The rubber standoffs have a correct orientation (look at how the holes are not exactly centered).
I was missing Qty 4 1/4-20 lock nuts, which was annoying but easily solved by a trip to the hardware store.
The rear bar clears the shark fin (barely). The other bars can be put about wherever you want them. I put them about 10" apart from each other, and left the sunroof area open. I ended up with an extra cross bar due to this.