Power at the field is very nice. I put a marine deep cycle battery in my trailer in an enclosed box in a front corner so it is out of the way. It is charged via a solar panel array on the roof. It also connects to my truck's electrical system so when the truck is running, the trailer battery is charged. I put a relay under the hood of the truck that disconnects the trailer battery when ignition is off to prevent draining the truck battery. I ran heavy lines (6 gage I think) to the back of the trailer for power distribution. On one side of the trailer by the door, I mounted all my switches, connector, electronics, etc. The trailer battery runs multiple 12V banana jacks, a 120VAC power inverter, interior florescent light, and a 400W stereo system, CD player, etc. The stereo is nice, but the lights are awesome when packing up after dusk, and the 12V jacks are always in use. The 120VAC I don't use much, but it is nice (I've used a 120V soldering iron a few times.)

What's really nice about trailers is you can pack a lot of stuff in them if you are creative. Mine is only a 5'x8'. I have the above electronics, a 35% carden, two 2M pattern ships, some electrics, and all my flight gear, tools, extra props, cleaning gear, etc., which is four cases and two buckets. There is still room and I occasionally will pack a pop up sun shelter, cooler and lawn chairs too. In addition, I have a well stocked first aid kit, a fire extinguisher, two way radios (for finding downed planes in tall corn), and binders with a lot of info, such a trim charts, patterns, instructions, etc. All this "extra" stuff mounts to the walls so it is out of the way. It looks tight when packed, but once at the field, the trailer opens ups a bit as a lot of stuff is removed, i.e. plane, pop-up, cooler, some flight gear.

Sorry no pics, but maybe some can use my setup for ideas on theirs.