For backing up into a campsite, we've used a flashlight in the hand or on the ground.
I do like the idea of a clip-on 12V light that can be plugged in to the 12V exterior
outlet, then clipped to the bumper. May have to assemble one.
For security concerns, I've added a illuminated (when on) rocker switch near the bed,
Escape Trailer Owners Community - dfandrews's Album: 17A Mods - Picture
that turns on the exterior running lights (markers/clearance/tail).
That provides plenty of light to ID who or what is outside.