We are thinking of buying a 2011 Chevrolet Dmax 3500 HD drw. We have a 16K Reese hitch in our 2005 GMC 3500. The new truck has a deeper box. Has anyone had to make any adjustments to the hitch to pull their 5th wheel. Right now the hitch in the truck is set at the highest holes making it as low as it will go in the truck. The pin box is in the lowest holes in the pin box making it as high as it will go. Rex Brown
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