When we are dry camping in our fiver, I usually carry 2-3 extra batteries in the back of the truck. I now use two sets of heavy jumper cables with winch type connectors on one end of each set and ring terminals on the other ends. Before that, I had a lighter set of jumper cables which I cut into about 2 feet from one end. I then put a male and female rv plug on the cut ends. While at the campsite, I plugged the trailer pigtail into the longer section which was connected to my extra batteries in the truck. While riding around, the shorter section was plugged into the truck's in bed plug and hooked to the batteries so they might charge a little while driving. How much it really helped-who knows? It did make me feel like I was doing something.
