I needed a solution like this, and ended up developing an entire Kit that I now build and re-sell. Very easy to install, and provides a very good amount of light inside of clamshell style trailers.

If you have a toy hauler or other style trailer, I'd be happy to work with you to design another version of my lighting kit to fit your trailer.

Here's the post about it, and a pic to show how much light it throws: http://forums.atvconnection.com/clas...-trailers.html

 

I've used the LED lighting in my camper, it do rather well, awesome and shiny, the white-colored lighting are the smartest. And they were simple to set up, stem the record, and put it where you want it.