So, the family and I are taking off in two weeks for a ten day trip out to Yellowstone. I don't own a generator, the pup battery won't power everything for the full stay in the park, so I had to figure out a way to charge a battery while the pup is parked at the campsite. I got a 6 foot pigtail for my 7 pin connector. I put battery clips on the hot and ground wires to hook up to a battery. Now, I can charge the battery while driving around the park by plugging the pigtail into my 7 pin connector, setting the battery in the back of the truck bed and hooking it up to the battery clamps. The hot wire in my 7 pin connector is switched by the ignition switch, so I won't drain my trucks batteries (yes I have two in my diesel super duty) while the truck is not running. It does look a little strange having the pigtail go up and into the topper on the truck, but I can live with that. I had not seen anyone else post about this type of solution. I have not taken any pics yet, but I may get some up later.