Set the camper in the truck on top of the harness. Caused some strange power spikes in the truck, and didn't have tail lights for the better part of 300 miles... sporty!
We have 2 pigtails. one is the normal seven pin and the other is a 2 pin with a pair of #4 wires to run the refer while on the road. We keep them both out of the way until the camper is set down and then we plug them in to the camper.