Rear light bar options?

Hi all, I just bought a 2014 long bed SR that came with an aluminum topper, and this light bar on top. I took the topper off, and disconnected the wiring for now. Does anyone have any good ideas for something cool to do with the bar or the wiring without having the topper on? I'll attach a similar photo of the controller that's mounted under the console

 

The truck seems to be a former fleet vehicle, I don't know if this controller could maybe run some light bars or something?

 

Maybe try contact etrailer on the switch? I am also trying to figure out how to get some chase lights on the back of my truck. Seems like a bed cover with T-slot rails so you can mount a cross bar is the only real option. You could also mount that at the front of the bed maybe?