I've got the big metal breckers. I run one for the earth complete for the whole vehicle (now i'm running bigger motors need to double this up) and isolate the positive power to the winches. So when you kill one switch it isolates the whole vehicle.
I wouldn't bother with the red plastic ones there cheap and chearful, and like boothy says when you add up all the electrics our trucks run you'll probably find they just arn't up to the job anyway