I know the trailers are a little different but at the dragstrip where the cars have no ground clearance, the guys will have rubber "stands" at the top of the door that hold the door off the ground. Then they have an aluminum extension that folds out that is usually about as big as the door. It does alot for the ramp angle.
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2015 Sierra 357TRIP
2012 Ram 2500 CCSB 6.7CTD
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