I had picked up a small (3000 lb) atv winch a while back when it was on sale at Tractor Supply. I set it up for portable use, mounting it on a 3/16" plate. The plate has quick links so it can be attached to a tree or the car hauler rail with one or two axle straps if needed. I never did like the wiring harness that was provided with the winch, no contactor, just a straight run from battery to switch to winch of not so heavy wire.
After replacing the leads on an old AC-225S welder, I had some surplus 4 AWG cable available (a short spare lead that came with the welder & in decent shape unlike those on the welder). Since I already had the tools for crimping lugs, spare wire & lugs, I ordered a replacement atv contactor set ( https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 ) some 1/2" heat shrink and a set of 175 amp anderson powerpole connectors with contacts for 4 AWG to swap things out.
This is the old wiring harness I removed, not sure but at best it might be 8 AWG (thinking it may be more like 10).
The contactor got mounted on the back edge of the 3/16" plate & 4 AWG feeds made up for winch & battery connections. The contactor kit came with boots for the terminal connections. The battery end of the cables got an anderson connector. The IN/OUT toggle intended for vehicle mounting is now a pendent on a 10' cable. The hot wire for the switch got extended to match the length of the contactor control leads & mounted via ring terminal to the (+) battery connection on the contactor.
I upgraded the battery side connector to 4 AWG as well. This is the deep cycle battery that is part of the solar powered components in the tractor storage shed. I can pull it out if I want portable power for the winch. The quick release clamps are the feed from the panel. The fused small anderson powerpole connector runs to the fuse block for lights & small inverter. In addition to the winch, the 175 amp connector can also be used to power an 800 watt inverter.