Thanks. Most Holmes winches are driven by a chain pto on the tow truck. The electric ones like mine are scarce. The hydraulic models are extremely rare. The nice thing about the electric is being able to control it from outside of the cab. I've ordered an original manual reprint. It should be helpful since there isn't a material difference between a skid steer 12V system and a truck 12V system.
The idea to have a separate battery with a lighter gauge charging cable is interesting, and I'll consider that. On the track steer, I already have auxiliary 12V at the hydraulic hookups. Perhaps that could be used to charge the second battery.