I learned I want an even bigger fire extingsher. My fire was caused by one of my accessory circuits. All fused but they were all the cheap wiring looms supplied by various vendors. Moving forward I will build my own. Stuff burned too far to determine exactly which one caused it. I already knew that Halotron is the way to go with an extinguisher. But I will say once my fire was out I had no mess other than the charred wires. Had I used a chemical unit that I'd wadger most carry, I would have a corrosive mess under the hood.
I generally wheel rocks at 11-13. Gone as low as 4psi in snow. No issues with the bead yet with OEM wheels and various MT tires.
I never heard of Halotron till you mentioned it above. I have 2 extenguishers mounted in my 80 series and I doubt either are "clean". Looks like I'll be replacing them pretty soon!