Super bright in fact. They would ease backing up alto! Soon as I get my fish tape back I'm going to have to figure out how to string that line. Where did you pick up the tail lights in the spoiler? Down at the bottom somewhere?
First thing I can tell you is - "patience grasshopper".
Best I can tell the floodlights get their feed from across the roof and down to the switch.
I didn't use a fish tape, too big on the end. Unless you have an old one laying around (flat style) and you want to cut the end off. I used a automotive speedometer cable. Got one years ago when when working in the dealers (and I worked on Hemi GTS's), universal version is like 12 feet long.
The backup light feed is in the harness up to the junction box on the pin box (yellow) I used about 50' of 10 gauge yellow from West Marine.
I removed the 2 screws under the bedroom overhang and then from the propane compartment I started "fishing" Once through I ran two wires. 2nd one was just from the pin box to the propane compartment - a spare just in case.
This was the hardest part of the job.
From there through the wall between the battery and propane compartments, following the harness down and under. I already had the underbelly off. If not I probably would have run it along the outside for now.
I snaked the wire through whatever conduit was under the trailer to the left rear corner.
This was difficult part number two, getting up into the channel in the garage.
From there I pulled the one floodlight and left side marker light and then just did some more fishing, this was difficult part number 3. May be a lot easier for you. I don't have the cap that you do.
Keep in mind when done, when hooked to the truck and if you turn the flood lights on from inside the garage your truck's backup lights will come on. No big deal - how often you going to do that?
It was well worth the effort though.