there are plenty of lights available which would work great.
the question really is... do want them for conventional purposes like notifying traffic behind you that you are backing?
Or do you want to see better when backing into a campsite at night?
If the latter is true, then you might consider placing a single driving light
under the bumper out of sight facing downward.
This puts a big pool of light
immediately behind the trailer and illuminates the ground under the trailer and on both sides from the tires
came with conventional backup lights . My Ranger is wired for them, my Escape
is not. There is not much real difference as far as illumination behind the trailer, but they do work as indicator lights.