After having one or two "experiences" with arriving after dark at campgrounds, I decided I needed to do something to add a bit of extra lighting to my HTT. Twice I've run into having to back into very tight approaches to our site and during the day this would prove no obstacle, but with poor lighting at night, this was quite challenging.
I started looking at mounting some aftermarket driving lamps under the rear bumper to illuminate both rearward and alongside the wheels. That's about the time that I stumbled on the
Blazer Heavy Duty Magnetic Work Light.

These things come with a 20' cable wired to a cigarette lighter plug. I ended up buying two of these from Tractor Supply. I promptly chopped off the cigarette lighter adapters and added Anderson Powerpoles to each lamp.
The next thing I needed to do was get power out to the rear bumper. Conveniently, my converter on my X19H is right below the rear bunk, so I was able to go right up through the flooring to grab power. I ran this to a 4-Flat trailer extension (wired as two hots and two grounds -- the exposed post being a ground).

The 4-Flat has a weather-protective cap to keep this thing out of the elements.
Since I wanted to be able to use either one lamp by itself or two together, I made an adapter from the other side of the 4-Flat to two Anderson Powerpoles.

And with two matings of Powerpoles... let there be light!

With the magnets on these things, I can easily position them above/below the rear bumper to illuminate behind the trailer and along the side to spot the wheels for a pivot into a tight site. And since they are not fixed permanently to the bumper and come with 20' cords, I can easily use them as work lamps during other aspects of camping.