To close this one out, yes there must be a ground loop. I got everything reconnected and the lights started working again. No blown fuses or any other problems. The factory wiring was a very poor job under the camper. I noticed when greasing the bearings this spring that when the suspension is extended the brake wiring is pulled as tight as a guitar string. It was on my list of things to fix this fall but the tire blowing out sped that up.