I know this is old, but I have developed a HID back up light kit for the 99-up Chevy GMC trucks if anyone is still interested.
I'll start a new post with pictures in the electrical section. Basically the new kit will fit any vehicle, car or truck.
They help tremendously in providing a lot of light for safer backing and/or work light. The kit is totally removable to allow you to return the stock bulbs if wanted.