Although I couldn't find the exact size insulation I was hoping for, skoolie subfloor installation day 1 was a raging success!
A lot of planning went into my skoolie subfloor installation. At 6'2", I'm a tall dude. I don't have much headroom in Earl. Since I chose not to raise the roof, I had to ensure my subfloor was as thin as possible while still providing at least a moderate amount of insulation.