Why not get a couple of 40# Tanks and mount in place of the 30's. I did that to our 2010 2955RL and only had to move up the holding straps a couple inches to be closer to the center height of the 40# tanks.
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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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