Generally when you wire a winch (which I have Never Done) the wire is simply a battery cable, a thick stand wire with thick sheathing, the specs you got there are for audio wire which is a thin strand wire with thin sheathing to make it plyable and bendable. Two different applications.
I will never forget the time a kid came into the install bay to have a amp put in and he said he had all the wires, Open up a plastic shopping bag (which is never good) and inside were RCA plugs from a old school Nintendo, some 22 ga head phone wire and Romex for the power supply. Dumb A$$