Kent I had pretty much the same set up for years, and youre correct, the trailer lights wiring is too small to power a decent sized electric wench. I installed a deep cycle RV marine battery on the trailer near the wench n it worked fine. I kept it charged from the vehicle while driving via the plug n connectors AUXILIARY terminal which I had wired to my truck battery with 10 gauge wire and a 30 amp circuit breaker at the trucks battery.
Piece of cake n it works fine and anytime you drive youre charging the trailer battery. of course, I had the trailer battery inside one of those protective boat type batery boxes and I also used its power for my break away safety trailer electric brake system.
The breaker at the truck will trip out if you pull more then 30 amps back to the trailer and if I was gonna use the wench a lot Id unhook the trailers electrical plug to the truck so as not to run the truck battery down from prolonged heavy wench use. If you wanted to get fancy you could wire up a relay such that the trucks battery was only connected to the trailer when the truck was running to avoid and truck battery discharge problem but I simply unhooked it if I was gonna use the wench a lot.
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