Just found these pictures that I had. They were originally posted by someone that I know on another MX forum. I still have his original quotes/description too:
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Here is the view from the rear...note the things along the sides are water tanks, not fender wells (this is a 6x12, the wheels are on the outside). In front of the orange water jug is a box that contains the AC/DC distribution panel and converter/charger.
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Here is the console I built that holds a Sony CD player, 4-6x9's, AC outlet, DC outlet, and a small LCD panel that monitors the charge left in the battery.
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Here is the right tank and the gas can holder I made.
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Here is the left 30 gallon tank and the spare tired I bolted to the wall.
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This is a really cool light that my buddy made. It hangs in this holder that I made until I need it outside at a night race, the I lift it out and drop it down into the hollow bar thing that latches the door shut and it will twist whatever direction I need it (I can also remove it and use it at the back door)
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This is where the deep cycle battery is located that powers the 12v stuff in the trailer. I also throw air filters, hoses for pressure washer etc. in here.
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This is the EZ-Up holder that I made
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I just have a single group 24 battery that I pulled from my motorhome (when I switched it to 2-6v's in series). Basically all I run on it is the small ceiling lights and the radio. I would imagine it would run a VERY long time, but at night races I generally plug the trailer into the generator on the motorhome and the converter/charger that I installed in the trailer has a 3-stage smart charger built in that tops off the battery.
The CD player and speakers are mounted in a box I made out of partical board and then glued the white FRP (Fiber re-inforced paneling..available at lowes or home depot) and trimmed it out with aluminum angle. The power comes from a 12v battery mounted in the diamond plate toolbox on the tongue. It is fed through conduit under the trailer then up through the floor into and RV AC/DC distribution panel (it has AC breakers on one side and automotive fuses on the other side). From here each AC and DC circuit is on it's own fuse/breaker.
Also I didn't mention how the water tanks work. They are RV fresh water tanks that I covered with diamond plate for protection (because they are very thin). The 1 1/2" plumbing of the tank goes through the floor into a tee and then out a spigot on the drivers side. The tanks are "backfilled" through the spigot... that is what the vent hose out the top is for. I also put valves on the vents so water doesn't splash out or leak out if stopped on a hill.
$100 flooring
$180 diamond plate box
Battery...from motorhome
Converter/charger.. took from motorhome
CD player... already had laying around
wiring....most of it laying around
$120 two pingle removable wheel chocks
$20 paint
$150 (I think!) tool chest in the middle
$90 water tanks
$30 assorted plumbing parts (spigot etc.)
two sheets of partical board to build stuff (don't remember price)
two sheets of the white FRP I used to cover the stuff I built
aluminum angle to trim the pieces I built
Assorted diamond plate stuff (free if a friend has a job that allows him access to the materials and equipment)
Closet-Made shelving sides and up front around $150 total probably
And here's the center tool chest/cabinet thing:
Stack-On Tool Chest
He originally linked me to www.toolking.com as having it...but it doesn't look like they carry it anymore. It's a "Stack-On PSCS-5, Silver Steel Plastic Tool Tower".
Hope this helps.

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