I power everything with the two batteries in the battery box, except the air conditioner, which will need line current or a generator. All the lights are LEDS so the lighting draw is minimal. My plan is not to be where I need an air conditioner to sleep at night - hence either at altitude or higher latitude to keep me cool in the summer. Actually, I prefer to travel in the spring or fall and stay home in the summer, all things being equal.. The furnace is propane powered, but the furnace fan does run on the 12volt power from the batteries. In 4 days at 19 degrees at night, I could not measure any significant voltage drop in my batteries. There is a voltage meter with the battery charger in the battery box - very nice set up.
There is very little I would change in mine. Ashley has added a step beneath each cabin door, and I think that is a good idea. I don't really need step, but my wife does use a little plastic foldable green step to help get in and out in the middle of the night.
I am planning to add some large clothes hooks to the font edge of the trailer fenders to hang a plastic bag with my shoes in - it is nice not to bring your dirty shoes into the cabin at night in the dark, and it is nice to have them in a plastic bag so they are dry in the morning as well. I just set mine on the front of the fender in a zip lock bag, but a hook would be nice to hang them from.
I am planning on building an attachment to the fender on one side, so that I can suspend a 2 x 4 foot sheet of plywood to use a table when in camp. Rather than a leg at the distal end, I am thinking of a chain or cable to hook on the roof rack and 2 hooks on the fender to support a portable table.
I did not mount my license plate on the lower left side under the light, because I could not figure out how to attach a frame work, as the lower edge of the kitchen cover is abut 2 inches thick there, and it just wouldn't work I tapped and thread a frame on the metal arm of the spare tire carrier, and it seems to be quite secure.
I am going to stick with the tires that came on my FJ, BFG ATs, since I also have three of them for my Moby1 - even though I have thought about larger tires at times.
My 50 L Arb freezer is in the kitchen, tied down to a couple of aluminum angle irons attached to the sheet metal pan it sits on, with bungee cords. It should run several days with out charging the batteries, but I do have a 60watt solar panel if I need it.
I did buy the radio/sound system from Ashley,and it is nice, but I find I rarely use it. I prefer to use an iPod and keep quiet for my neighbors, I guess. I might skip it if asked next time.
One thing the Moby did not come with, that I strongly feel should be required for all trailers with a furnace, is a carbon monoxide sensor/alarm. You can get small battery powered one, fairly inexpensively, and that is what I did. I asked Ashley about this, and he agreed that it was an excellent suggestion. No one should sleep in a small closed space without a carbon monoxide sensor. I even have them in my house as well.
I thought long and hard about the 60 in wide version, but felt that it would then be wider than my FJ, and the trailer wheels would no longer follow my FJ's wheels so nicely.
Thee are two options I strongly recommend One is the hand brake, it really makes it easier to maneuver and position and lock by hand.
There other option ( that I think should be required ) is the electric brakes. When you are descending on a steep gravel road, you REALLY do not want the trailer to push you down the hill, or slew sideways. The electric brakes allow you to manually use the trailer brakes to help keep your rig controlled.
The trailer is not really heavy, but it is heavy enough that you will definitely know it is behind you if you tow with a jeep or an FJ. If you tow with a large pick up, then it is less important on asphalt, but on loose gravel, descending, you will really appreciate the security electric trailer brakes offer you.
I have a Trasheroo for the trailer spare when in camp, and I have a separate tent for the port potty if needed.
There is about four feet of room in the camper, so one can sit in bed and read with out any problem - it really does not feel claustrophobic to me, although I wondered if it might.
I did not get the roof opening fan, as it was not an option when I ordered mine, but I think I would strongly consider it. I may even see if Ashely can put it in later if I drop the trailer by for a few days.
Just a few random thoughts. You will get lots of questions from folks when you gas up as you travel, it is a great conversation starter.