I'm working on the same problem in my '08 right now. Not enough light in the front or the back at night. I've looked in Auto Parts stores, marine stores, Cabelas, Academy, Quadtratec, etc. etc. for some sort of easy-to-add light(s) that are bright enough.
For me, I won't be using these that often, but when you need 'em, you need 'em. Even something that's battery operated would probably work, but most of those don't put out enough light to do any good.
However, at Cabela's, I ran across a Coleman brand LED tent light, that runs on AAA batteries and puts out 60 lumens. In the Jeep at night, it's plenty bright enough. And for the JKU, one of these can be velcroed to the front of the factory sound bar to light up the front (and read those maps), and to the back panel of the hardtop in the rear, for more luggage area lighting.
Don't yet know how long the batteries will last in these (going to use Lithiums), but I'm going to start with these. If they don't work, I'll try some LED lights that are wired to vehicle power.