"backup" light

I picked up a cheap LED flood light, 27 watts (100 watt equiv), that I would like to mount on the rear of the trailer somehow, in as non-invasive manner as is possible (no drilling). My plan is to use it for some extra visibility backing up if I get stuck out after dark.

The fixture comes with a basic C shaped bracket designed to be bolted onto something.

suggestions?

I plan to provide it a dedicated fused and switched power lead, rather than taping into the trailer's safety lighting.