Installed the Curt hitch that was designed specifically for the ST earlier in the week. Got to to try it out this Sunday. I was a little concerned that the heat from the exhaust would have an effect on the plastic caps on the Thule rack. After 15 miles of driving, I pulled over to check on it and there was no issue at all. The rack wasn't even warm.
I think this will be a pretty good mountain bike vehicle. Not as comfortable or convenient as the Silverado but a lot more fun to take to North Carolina.