Been working on insulation. Here’s where I’m at:
Tent walls: all 4 have rumpl blankets floor to ceiling. I added some reflectix in the cab-over area behind the blankets to keep that area from getting so cold. Skipped the rest of the tent since I don’t want to hear the reflectix all night and need an emergency escape
Front GFC wall is covered with 1.5" foam and 3/16" HDPE sheet, to which all of my electrical stuff is mounted. Front bed wall is bare to allow some cold to cool the chargers and inverter.
Side walls have reflectix hanging from the top of the GFC to the floor of the truck, with rumpl blankets in front of that.
Rear wall has the side wall rumpl blankets (two person) wrapped in front of it as “doors”. The corners are held in by carabiners on an NRS strap that runs along the top of the door. The rumpl blankets in the bed are folded in half, so I slipped some reflectix between the two sides as a radiative barrier.
The floor of the truck bed is 1.5" pink foam with 3/16" HDPE sheet over the top to isolate me from the cold ridged truck bed.
I also added a ton of duct tape and foil tape to seal in all the cracks. 3D printed a bracket that attaches to the accessory mounting point to help keep the blankets in place in the bed.
I had the blankets in before, but no reflectix and there were lots of gaps. With all these changes, I need to test how much the heater will be on. My guess is it could be 0F outside and it would be 65F in here and the heater would be on roughly 50% of the time.
