Do you really want a custom system that centralizes the power? if your on the road for such a long time stuff is going to fail due to use, exposure and time. The solar system comes with a battery to charge, don't you just need another one for the dyno? As for the side lights, can you just have extra tail lights on the side too? then if the tail light fails you can move one of the side lights to the tail. I'm just thinking off the shelf with some redundancy gives more flexibility. I've been curious, is it possible to have dyno's on both front and rear wheels?