Here is an update to this thread.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/26488825/srt/pa/pging/1/page/1.cfm
I replaced the incandescent bulbs with LED modules in all the light fixtures in our trailer.
To do this I took down all the fixtures in our trailer, soldered leads on each LED module and then soldered the leads into the fixture. I attached the modules to the fixtures with double sided sticky tape.
I used 1 module per incandescent bulb.
We've been using them for a couple years now. They work fantastic.
No more worries about running the batteries down and our solar panels easily replenish whatever energy they use during the night. And they are way brighter than the bulbs they replaced.
We now leave the bathroom light on all night. Our kids stay up late reading all the time, using the light in their bunk. Its great to have good light in our trailer.