wired 8 gauge from truck battery to back of truck, installed a slide plug rate at 50 amp at back of camper that goes camper battery, can plug the plugs together to charge battery from truck to camper or remve plug and plug into 12 volt from generator to charge either truck or camper battery, plus it gives me a connection for 12 volts for what ever I want up to 30 amp thats what the breakers are, could run up to 50 amps with wire and plugs but got some saftey this way