Sounds like the mfg. of the chassis forgot to heat shield the bottom of the doghouse, or at least the fasteners.
You don't say what year your unit is, but if it's under warranty, you should have the dealer put some heat shield insulation over the bottom side where the bolts stick through.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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