I generally plug into shore power before I even disconnect the truck, and if on an overnite, will not disconnect if the site is long enough to remain hooked up.
If things work on 50 amp and won't on 30, sounds like you have a bad 30 to 50 dog bone/adapter.
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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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