not sure if this would be a fit, but we had to replace the lights in our tent trailer last year, and the previous owner had stripped half the origional wiring and so we had to be creative. Here are two items that were great little finds . . .
1. Home depot sells a nice little mini florecent tube light about 12 inches long. They come in a plug in style or a wire in . . .
2. We bought a mountable ceiling light at Walmart that looks kinda like a double trailer light, but opperates on a couple of batteries and has a pull cord which we shortened. You can light just one side or both, and the unit even swivels. It costed somewhere between $10-$20 and gave a lot of light. It is about 4x8 inches in size. One set of batteries lasted the whole season. You will find this light in the area of walmart where the lightbulbs and nightlights etc. (hardware dept?) are kept.
Not sure if either of these is an answer, but they worked for us . . . good luck.
2003 21 ft Forrest River Shamrock