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Without knowing the group size , rated amp hours and load, it's near impossible at this end of the inter web to say for sure.
If your trailer is plugged into the tow vehicle and everything is working properly, the trucks charging system should keep the trailer battery charged and it shouldn't go dead in 1 hour.
Are you sure the 12V charge line is active at the bumper?
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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