On a 2012 Ford I found a slick way to get an in bed plug without drilling a hole. Buy a whip, plug it into the bumper outlet, remove the drivers side taillight and route it neatly up through an existing hole in the bed. Then install the plug on the end of the whip. Mount it snugly, with just enough room to open the plug cover, with an "L" bracket under the bed rail. Then test, and put the taillight back.
Works well, you don't bash up the plug, keeps everything dry and is easy to reach flat footed from the ground. Hand finds hand when you plug it in.
