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!
As I back under the TC, the cord is looped over the front left jack head.
When I get the camper close enough to plug it in, I leave the rest of the cord hanging out over the outside of the pickup box.
Only once the TC is resting in the bed and the jacks are retracted do I push the rest of the cord into the pickup box. No possibility of the cord ending up under the TC.