I found the issue with the spoiler and 3 lights above the rear window -- For those who might have the same issue: I went under the R-pod where the green wire (running lights power from the truck) exits the 7-prong cable and goes into bundles of green and green/white wires. There is a convenient wire jumper between two bundles. I cut the jumper and using an ohm meter I tested wires in the bundles for a short (0 ohms) I found that the front and wheel running lights were good/working. But the wire to the rear had 0 ohms when testing between the green wire and ground. I followed the green wire in the green, red, brown wire group to the rear of the trailer. In the corner past the heater, I found another junction/bundle of green and green/white wires. By testing each wire, I found one green/white wire was the issue and when I cut / separated it, all the running lights on the sides and in the rear lights returned to working. 

My short is in the green/white wire circuit which appears powers the 3 running lights in the air spoiler which are not on when all other running lights are. 

Now this where I need help. I traced the green/white wire across the floor and behind the converter where I lost it. The air spoiler is well caulked and screwed into the body. I'm not sure if I take things a part I can fix the issue and not sure if replacing the spoiler is worth the effort. Anyone have this running light problem in the air spoiler and solved it?

Thanks! Bob

BUT, I did find my wire short. The green/white wire running from the back corner wire junction goes over the door and then under the water heater and the furnace before going towards the kitchen complex and the up to the roof. I cut the wire in the back and pulled it from under the furnace and found the insulation rubbed to the metal which I suspect when it contacted the furnace housing, it shorted the circuit. I don't know why the truck fuse did not blow. Any thoughts? So, all my other running light are working which is a moral victory. 

Interesting to note the many loose wires running under the furnace. Better would be to have all the wires in a conduit or tied down. I suspect I tugged the running light wire in question when I was doing something and cause it to get squeezed between the wood support of the furnace and the furnace causing a pinch point and the rubbing when traveling or running the furnace.