I did install exactly the set of LEDs in the first posting. I got the type where the LEDs are encased in plastic so are weatherproof. The power connectors/boxes are not, so in event of a heavy rain I do unplug them. Am using the AC plug that is on the outside of my coach which is located close to the rear arm so haven't bothered with trying a direct 12v feed. The LEDs are permanently stuck to the roller bar (using the sticky backing that was built into them) just in front of the channel, so I still have the channel available if desired.
Prior to that I was using a set of string lights (typical C-world night-light style) using the cloth-hanger-S-hook-in-the-channel system. Having a power awning over a slideout that only goes out straight it required about 15 minutes of step ladder time to deploy and remove. Got to be such a hassle that we rarely used them, especially if rain was possible and the awning would need to be retracted.
Yes, the fact that the rollar rotates makes a permanent connection impossible, at least as far as I've been able to figure out. However, it's about 1 minute to plug the power cord into the LEDs at the roller, lay the converter/cords in the awning channel, and plug into the outlet. Then everything
is done by the remote control, which I velcro'd that back with the hook material and just stick on the carpeting in the bay surrounding my radio.
When the awning is fully extended the LEDs point directly down, and by tapping the retract button once or twice I can angle the LEDs back towards the RV. Attached is a photo of them in use, with the setting at 'white full power.' Bright enough to read by. Usually I run at about 1/2 this level, and sometimes switch to "red" to preserve night vision.
Not a perfect solution, wish I could figure out a permanent 12v that didn't require plugging at the roller, but 10x easier than what I was doing before. Probably I could figure out a way of routing 12v power up the arm and either tap into a bay or put the remote electronics and 110v power there, but would still face a moment of ladder time to plug in at the roller, so not really any more effort to run the power down the arm at that point.