If the truck now sits higher you may have to get a drop hitch or adjust you reciver hitch lower to keep the rig level. Plus if the overall diameter is larger, you have reduced your towing capacity same as if you lowered your differential ratio, but with the Duramax and your little TT you shouldn't see much difference other than the speedo being off.
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2011 Chevy Silverado 3500HD Ext Cab LT DRW Duramax/Allison pulling a 2012 SOB (still Thor, but not a Keystone), Dual ACs, 4 Door Fridge, Fireplace, Sleep Number Bed, Level-Up Auto Levelers, Disc Brakes, Winegard DirecTV SlimLine Auto Dish, Onan 5.5K, Splendide Combo Washer/Dryer, GY G114s on HiSpec 17.5 wheels, TrailAir Tri-Glide Pin Box, Mor/ryde IS.
Michelle & Ann Sullivan and 4 American Shorthairs
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