Tim, will sort of depend on which tire option you're getting. I had a 2005 3500 DRW long box 4x4 and upgraded to a 2011 3500 DRW long box 4x4. Beds were exactly the same height, but the side rails on the 11 are approx 1 1/2 higher. Had close to 8 inches clearance on the 05 and am now down to 6 but didn't change hitch height or anything and Monty ride pretty close to level. But on the Dually I'm limited to the 235/80R 17 Tires. I know this doesn't answer your question, but gives you a little more info. You will love the new features, except the DEF (PITA)
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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