...hemp matting...flammable, but if you have almost any kind of fire in any RV it's unlikely to matter much about the insulation...based on the fires I've...
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re : flammable, fire, fires
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For a moment, let's shift focus to a fire inside a rig.
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Based on my experience, pretty much everything in a vehicle seems designed to burn, burn efficiently, burn ruthlessly, burn until the vehicle is rubbish and must be replaced:
* upholstery
* insulation on the miles of wires
* foam in the seats and dash
* carpet
* head-liner
* tires
* under-coating
... and the liquid in the fuel tank(s) and crankcase.
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Either three minutes or two, I think stuffing straw in the walls makes zero difference in the rig burning to a puddle of coagulated metals and cinders.
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I think prevention is better than on-the-job learning to fight fires.
And even if the fire only destroys part of the rig, could you trust the frame to remain straight and capable of resisting stresses for the next couple hundred thousand miles of bouncing?
After the temper engineered into the metals is modified, certain safety questions come forward.
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Can a burned wheel or transmission be made serviceable?
Unlikely.
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My suggestion:
* grab your Bug-Out Bag, and bail.
You can do very little to delay the inevitable outcome.
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An aside:
In our ExpeditionVehicle, we carry six full-size extinguishers.
I refuse to go down without a fight.
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I was tall and strong for my age.
1968, at 16yo, I was a volunteer fire-fighter in a rural district.
I witnessed aircraft fires, structure fires, vehicle fires, fields and forests aflame.
Do I realistically believe I can stop a fire inside our rig?
I tend to believe in miracles.