Added an auxiliary tail/turn/stop light with an inexpensive LED strip. attached with adhesive tape. Ran a piece of D-Line White wire raceway fitted into the end of the LED strip to the right side channel. After extending the wires and reattaching the 4 pin plug, ran the wires down the channel and then just connected it in the 4 pin trailer plug. Added a couple of zip ties underneath and buttoned things up.
To make the D-Line raceway usable I stripped off the adhesive tape that is only suitable for indoor use, cleaned it thoroughly, and mounted it with 1/2 inch 3m VHB tape. Here is the result...