anyone ever seen taillights on trucks cab?

years ago at slamfest there was a sick and super clean s10, white/red 2 tone. he had trailor lights that were magnetic and when he was driving he put them on top of the tailgate. You could make a little shelf towards the inside of your bed just big enough to hold the lights and noone could give you shit. plan it right and you could hide all your wires, and maybe even the shelf when parked at shows.

back in the day there was a lincoln from az that had trailer lights in the back window and it was crazy