I've recently picked up a 450A contactor to replace my winch solenoid in the control box. While the wiring seems straightforward, I'm wondering if it's necessary to use 2 of them in series to replicate the original solenoid controls? Most winch control boxes use 2 pairs of solenoids in series (4 total), I'm assuming as a safety measure because if one sticks closed it won't cause the winch to run on. Is that necessary for winch contactors? There doesn't seem to be any backup if the contactor fails.