So I finally put mine on last night. Here is the dimmer module I ordered from Amazon:
Attached are some pics from installation. It works GREAT so far, and I'm super glad I finally did it.
I sealed the ends of the module with some flexible outdoor adhesive and added some red shrink wrap to close it up tight. I wasn't able to use heat shrink over all of it like I wanted primarily because I didn't have enough wire slack on the trailer. But I did use water proof heat-shrink butt connectors. I wrapped the whole thing up tight with electrical tape and tried to slide the module into the same track that holds the lights, but that didn't work. So while I was fussing with it, I noticed that the light track is sort of clipped onto the bottom of the gutter. So I was able to cut a small hole in the track and zip-tie the whole bundle up out of the way.
The remote doesn't work at any great distance; I'd say good up to about 10 feet maybe, but it functions exactly like I wanted it to.
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!