Recently I replaced all the screws attaching the vinyl trim to the fiberglass under-body (managed to come up with a technique to extract the screws without stripping the head or spinning the nutsert). Now that those screws are new stainless with anti-sieze, they can be easily removed. The LEDs are attached to 1 1/4 inch aluminum angle. On the top side of the angle I drilled oversize holes. I have some longer stainless screws with fender washers that hold the angle (lighting rail). I use about four of these to hold the lights. So I remove four of the regular screws and secure the lighting rail with the longer screws. The oversize holes in the angle just fits over any of the screws I don't remove. The lighting rail connects to a power plug in the rear. I reverse the process when I want to remove the rails.
Ron