'16 F250 w/o in-bed 7 pin plug & how to get a camper package

I had an in-bed receptacle two trucks ago. It was installed by the camper dealer using undersized wire and Scotch-loc connectors ensuring high voltage drop and little charging capability. They punched through the sheet metal leaving raw edges, so that's where the corrosion began. I also had to be careful when loading material to keep from damaging it. Beginning with my last truck, I now connect to the trailer receptacle and leave the bed clean.