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I made my own. Very simple and cheap. Get a 16ft waterproof LED strip with the 3M tape backing. You can find these online in different shades of white (I got mine in 6k color thru Amazon). Get yourself a good water resistant switch and some 18 or 20 ga wire and go at it. The LED strip can be cut every 3 inches so you can make any length you need. I cut two strips about 5ft each to fit under the bed railing. If they have the ends for the strips, then order those as well (makes wiring much easier). I put my switch inside the bed in the end stake rail (out of the way). Then I wired mine in with the running lights since they wont be on all the time and they dont have much of a draw.
It only took a couple hours (Im very **** about installs) and works really well.