What is surrounding the stainless box in the construction of the motorcoach...that is the concern. A lot of materials will combust at temperatures lower than 1598*F. If a fire breaks out in the box, yes-the fire inside would be contained; but a new fire could start from the heat transfer. If there are struts or angle metal attached to that box in the coach framing....they will conduct heat quite a ways from that box.Right only fireproof up to 1598 degrees just the same 304 stainless steel material used for my solo stove and the smoker itself.
I believe this is what Chop is referring to....the box is not fully isolated like an oven....