Hi Ben.
Here's how I did mine. I decided to put the AC and DC in the same outlet boxes for simplicity and convenience. AC is #12 wire and DC is #10. As you can see from the pics, there are basically outlets at the four corners of the trailer which allows me to charge everything you see and a few more besides. Each box has it's own fused circuit...no daisy-chaining. The wire channel and outlet boxes came from Mills Fleet Farm, and the DC stuff is from Radio Shack. I also added DC lighting under the shelving. All interior lights run on the onboard 32ah AGM battery with one light switch by the side door. I elected not to put AC lighting in mine. (It lives in my basement...well lit with a 12ft ceiling <G>
I leave the whole thing plugged into a UPS at home so the planes and heli are always ready to go at a moment's notice!
There are some earlier pics of the trailer here if you're curious about shelf layout, etc.
http://www.rcuniverse.com/forum/m_11...trailer/tm.htm
The clearance under the bottom shelf is 36" with about 7" between the two shelves to allow for wing bags, etc. The 79" ceiling height allows for large planes on the upper shelf too if desired. I have another trailer for generic hauling, so this one is set up permanently as an airplane hauler. I most likely won't build anything larger than 40-42% scale, so I elected to go with fixed shelving spaced to accommodate my largest anticipated projects. So far it has worked out great.
Hope this helps a bit.
Jim