Proof by picture...
All the teardrop grounds are accessed from outside the trailer. The Stop/tail/turns are grounded to the inside ribs. If need be, I left enough wire so that they could get pulled and an outside ground added if there are issues.
We still don't have a truck (waiting on seeing the new aluminum Ford trucks) so we used one of these to test it
Anyway, I'm as happy as a bird with a french fry!
On a side note, I found a new product that's really kinda cool, If you notice in the picture of the lights, my license plate light is installed way off to the left on a curved side section of metal. This is because I still intend to put the tire in a continental kit on the back bumper. But I needed a gasket that was bigger on one side than the other, and narrower in the center. Yes, I probably could have built up some buytl tape but I was looking for something a little more elegant. What I found was a moldable gasket material called Versimold.
Basically you mold it, shape it, then cure it in the oven (or with a heat gun) and it becomes a custom gasket.
The first time I tried to remove it from the light to cure it..... but it got stretched out and didn't fit nicely enough. The second time I left it on the light and put the whole thing in the oven with much better results. Sweet! Best of all I gave it the hose test and no leaks!
This light is grounded by the screws. But I did manage to find an LED bulb that fits. LED's don't like water but this is sealed in the little glass cylinder so hopefully it will be okay. I used this one.
That's all for now! I love my lights