Don't have any pictures of mine on this computer, but it's along the same lines. We decided to use our 27' Interstate snowmobile trailer for an elk/deer/antelope/camp/whatever else trailer about 10 years ago.
The things I've done, (so far);
I put in additional wiring for both 120vac and 12vdc. Both inside and out.
I have a Yamaha generater and a 12v 4D battery (actually it's in the Cat at the moment), under one of the trapdoors in the floor.
The other trapdoor is for folding chair/whatever else storage.
Suburban propane RV furnace; I relocted the sail switch in it so I could mount it flat on the wall, so it doesn't take up as much room inside. However, I would do it a little different next time and put in in an enclosed box under the deck of the trailer and duct it up about four inches on the inside of the wall. I put a 12hr timer in line with the thermostat so it will shut itself off at a preset time.
We just use cots and foam mattresses to sleep on at the moment. We put a hide-a-bed in it once, but the bed wasn't as comfortable as a cot/foam.
I built an adapter plate/fitting to run a chimney out one of the 12x12 fuel doors so I could burn wood, but I haven't used it. My brother-n-law has a woodstove in his, and we've slept in it on snowmobile trips. It will roast you out, (unless you are sleeping on the floor)!
I ordered mine from Interstate already completely insulated; floor, walls, and ceiling.
I put two 120v Cadet heaters in the walls, opposite corners.
I put the spare tire under the floor on a crank down spare tire thing from a Toyota. They come from the trailer factory mounted to the inside wall, and are always in the way.
My wife put one of those pull out single line clothes lines on each side of the furnace tha will reach across to the opposite wall to dry clothes on.
I bought a 6' kitchen counter from an older camper van. It takes two people to pack it in and then I just bolt it to the floor. I have a "T" in the propane line that goes to the furnace and that's where I plug in the hot water heater/stove hook-up. It's not pretty but it works. The counter has a sink, with a fresh water tank and a grey water tank underneath, behind the drawers, so it's a pretty self contained unit. I got the belly mount propane tank from the same guy who was parting out a camper van.
Towed the jet sled up into it a few years back with a quad, and took it over to Lake Roosevelt. Was nice having two quads, a boat, and a warm dry place to stay, and still have a truck to drive up into the hills to go hunting. I got some looks at the Hunters campground when I backed the boat out of that trailer with the quad. I recall we didn't even use either quad other than to unload and load the boat.
I also put a 60 gallon fuel tank under the floor as well. Used to make me nervous sleeping on top of a potential bomb. Don't think about it much anymore.
That's about all I can remember right now. Oh yeah, I built some aluminum shelves for it with coat hangers underneath. Also, I built a helmet rack. It's a work in progress. I do know that when the weather is really bad outside, it's way better than our wall tent.
Still don't have a decent stereo, or a flat screen... Someday, we will start spending more time inside than out and those things will become more important I guess. 'Til then, all we use it for is transporting/sleeping/and eating. We don't need anything fancy.
