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2021 3761FL I was appalled by all the open holes and spaces under and in the frame. I gorilla taped the coroplast to the frame along both sides, caulked come of the smaller openings by the rails penetrated the frame. I also gorilla tapped a bunch of 2" holes in the frame as well. Definitely reduced the furnace run time to heat the rig up to temp after. and stopped the draft from the cold air return grill in the stairs. well worth the time invested.
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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