If you want fantastic illumination of the rear cargo and tail gate/drawer area, I honestly don't think it gets any better than the cheap mod I did (Credit to @Mogwai for doing it first).
Scroll down this page and see my posts. Grand total of $26. Panel removal looks intimidating, but it's not so bad.
Also includes a link the the lights I used. There are 3 or 4 posts, so have a look if you're interested. Illumination is amazing...no shadows, and because it sits on the rear window sill, it attracts few bugs since you don't see the actual light source unless you're directly under looking up: