Lets hear your suggestions for a winch for a car trailer.

RAT ROD AL said

What's the best type battery to run a 12000# badlands ?

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You know, we all have heard advice about building things with common parts store parts in case you’re on the road and need a warranty/replace. Being a trailer meant for long hauls I am going with an O’Reilly Super Start deep cycle marine.
I briefly looked them up and they have somewhere in the neighborhood of 800 CCA, which is recommended for batter-only winches. Also, I would like to charge that battery off of the 2001 3500 Ram when driving. In order to do that I’ve been looking at dual input battery charger/regulator. Read this:

The Redarc BCDC dual-input battery charger allows for easy charging of a DC battery while you're on the move. Most battery chargers require that you plug into an AC outlet, but this DC-to-DC charger pulls power from your vehicle's start battery instead. The BCDC also has solar power capability so that you can keep your secondary battery charged while you're parked at a remote campsite. This means that you can go off the grid without worrying about being without power.

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https://www.etrailer.com/Battery-Charger/Redarc/RED96FR.html

For a typical lead acid battery setup, refer to the wiring diagram (shown with fuses and optional LED and solar panel - sold separately) below: