WE carry both a jump box, and heavy duty cables long enough to reach a vehicle parked behind (think they are 20 foot for the Jeep and 24 foot for the ram). I love the jump box, especially when .helping out a stranded motorist. I keep the cables because of my one is none, two is one prepper mentality. Cables don't have any circuitry to fail if they get dropped in the water, and can be used for more then jumping a dead battery, I have used them to jump from the battery directly to the starter when the factory wire failed. Sometimes old school is hard to beat, same reason I still have paper maps and a compass along on my trips.