im looking for help wiring my camper shell break light. my truck has a trailer plug wired in already, should i connect my camper shell hot wire to my trailer plug break light wire or is there a better way of doing this. also behind my bumper there is another ground and hot wire i think would this be a good places to connect the shell wiring? here is a pic of the wires that are behind my bumper they were looped with the other three wires and they were just taped over. any help will be greatly appreciated.

behind rear bumper passenger side