A lot of people say that they have had slide problems when their battery voltage is low. You say yours only works WITH shore power. That means your batteries are getting a charge voltage from the inverter.
Measure your battery voltage when shore power is NOT connected. Should be about 12.2V.
Dan
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2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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