Brent,
Thanks!
The tail light guards are a little thinner than what I was looking for, but they work for now. The gauge of the metal could be thicker, but it's definitely better than plastic. I searched around to find thicker ones, but this was the only thing I could find for now. If anyone knows where to find thicker guards, I'd like to hear about it.
I had to lengthen one of the bolt hole slots to get them to fit right. Otherwise, they ended up cocked up at the top inside corner against the side of the bumper loop. A couple of hits at the end of the slot with the cut-off disc and they're fine and level now.
The DS tail light had the usual bottom window for license plate lighting. Since I have the plate mounted in the center of the rear end, I didn't need the extra lighting in the tail light. I was going to paint or tape over the license plate light window, but found that the light case opened easily.
Inside, the license plate lamp, since these are all-LED, consisted of a small, angled array of 5 LEDs. After removing the 2 screws that held it in place, I cut the wires that fed it. Now the tail light doesn't have a useless light emission and I have a small LED array to play with by mounting it elsewhere on the trailer or in the truck.
There's also a lamp guard in the form of the angle right above the license plate lamps. I repainted the chrome finish on these lamps OD by scuffing up the chrome after taking the lamp apart. They are all-plastic, except for the mounting bolt, so I'm not sure how durable these will be. The guard above is definitely needed, even to protect against my errant knee, as they are kind of fragile.
That angle also serves as a place to hook the ends of the bungie cord to in order to tighten the tarp. I had to do a touch-up on it yesterday, but should finish attaching the bungie hooks tonight. I'll take another pic showing how that works then.