RO is nice coal, but this insulated concept on the summit is phenomenal.
Btw, I've had dead oak limbs make hot coals in a "Burn Barrel" lasting 3-4 days (un-insulated & Not damper-ed)
I'm shopping for a >55 gal drum to toy with insulating my UDS (likely just cut and expand another drum & fill the gap w/ strap of sheet metal)