Fireproof safes

[Ryan Wright]

I'm guessing the built in safe in my '86 PT-40 is not fireproof, and any cash
carried would be lost if the coach burned to the ground, yeah?

So I'm considering buying a fire proof safe. I'm fishing for mounting locations
/ ideas, but more importantly, wondering if ANY fireproof safes are good enough
for this application? Will a 2 hour rated 1850 degree safe adequately protect
it's contents in a fire fed by 300 gallons of fuel and a big old propane tank?
It seems iffy at best.

Any thoughts or ideas would be most appreciated.

-Ryan
'86 PT-40 8V92