Our Truck is a 2008 Ford F450 4×4. It started life as a pickup, but was converted to a box truck. The frame was stretch 36″ and an all aluminum box was installed.
1 3/4″ of insulation, we are using polyiso spray foam, its R6.6 per inch, that will give us about R11.5 in the walls. The spray foam is also a very good vapor barrier, so we get a bonus there too.
We are using a 12/120V marine fridge, that uses a DanFoss compressor. They are very very energy efficient and don’t need to be vented like a propane fired one.
We are doing a big bank, 500Ah, its four 250Ah 6 volt AGM batteries, two pairs in series gives us a 12 volt bank. They are heavy, like 100lbs each heavy.
We are using a Webasto Airtop st3500, its a diesel or kerosene forced air heater, very efficient, doesn’t suck down power like RV furnaces do, and quite compact.
Bullfinch unit. Its really slick, the hose plugs into the unit, and then it is used to adjust the temperature as well. It only requires a 2 3/8″ hole, and has a tiny mixing valve built in.