Bill, since they just thread on, I would suggest a little RTV/Silicone Sealant on the threads. We found the front one missing on our Montana and must assume it just vibrated loose and flew away.
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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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