Wow, that sounds really promising. I use LED strip lights under my cabinets at home, dimmable from voltage changes through a 110VAC transformer. I bought the same lights for inside undercabinet for the Monty and will install when it arrives (
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1). These are not color changing, but a good color for most applications. Power it from a 12VDC source and a dimmer switch and you've got a good application.
For the outside I also want to install 12VDC dimmable LEDs, RGB preferable, but didn't look at 5050 or 3528 diode size. There are many options. I'm not sure how'd I'd wire it, but noticed many at the Seattle RV show have it in the awning roller and use the edge of the awning fabric as the wire transport. I would assume you could work in a fabric clip or silicone it in place, but Hook's idea going down the frame rail is probably easiest. I know it really looks great, and love Bingo's idea of a caravan color concert!