This is the winch & battery set up I use.
I power the winch with a deep cycle marine battery instead of wiring it up the the truck. For me it makes it easier to uses different tow vehicles. I carry a spare battery just to be safe, but you get allot of pulls before you have to recharge. If the vehicles roll easy, I can pull at least 10 onto the trailer before I charge the battery.
That big Die Hard has 1150 CCA. This set up will pull a square body up a ramp in park with 4 flat tires.