I'm probably overthinking it, but I wanted a flat floor for the camper to sit on. I covered my entire truck bed floor with 5/8" plywood. In front of and behind the fender wells also. The plywood is in 4 pieces and the rear 2 pieces are captured behind the tailgate opening so they can't slide out. I have a rubber bed mat over that. I think the Bigfoot, and I guess Northern Lite, are mostly supported by their sidewalls. I didn't want my sidewalls half in and half out of one of the bed corrugations.
I plug into the 7 pin on the bumper and secure it with a cable tie. I don't want to lift the camper to access the plug. I also think the Ram doesn't isolate the truck battery from the camper battery, so there is a chance of draining the truck battery if I'm somewhere with no hookups. Easy to just unplug from the bumper.