If the converter isn't keeping up, then either the battery is kaput or your wiring is suspect.
Time to do some testing. First take the battery out and have it load tested. If it passes, put it back in. Then with the trailer plugged into shore power measure voltage across the battery terminals. It should be at least 13VDC, and if it isn't your going to be looking at the converter.
If it passes that test, then you need to measure the load on the battery. Unplug from shore power and using an amp meter measure the draw. It shouldn't be more than about 3amps IIRC. If it's more then start pulling fuses until the load drops. That will tell you where to look.
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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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