Here is the bed light system that I made. I put a little twist to it, I put some high power magnet in the back of the aluminum heat sink of the LED strip, so it just stick along the side of the bed. Just for fun, I put some extra wire to it so I can stick it under the tailgate to make it into a reverse light bar (I get power from my reverse light). By the way, the color is a little warmer on the bed light, I make display LED light on my day job, so I use some leftover jewelry display case light to make the bed light. I will change it out to something around 5000k in the future to match my reverse light
I put 2 tap of high power magnetic to the back, I drive over some speed bump, it hold on to the side of the bed without an issue.
The extra wire just tuck into the hole near to top of the bed.
Each one of these light bar is only about 20" long.
This is just for fun, but it is one crazy reverse light. It looks much brighter in person than in picture.