battery disconnect

Thanks for the help guys, I just looked under truck 7 pin wires go into a terminal, not sure how to wire in a solenoid, Since I have a 3ft deck on the back of camper unplugging every time could get to be a pain. The wire plugs into the front of the camper runs down along the insider of the bed and comes out at tailgate and plugs into the bumper. At the tailgate it can be reached easy, At this point is there any inline systems that can added to disconnect what wire that needs to be, or do they all have to be disconnected