You can say I’m jaded about things like this - are you going to buy a fire extinguisher to strap to your waste and those of you passengers as well?
What about installing a “Safer Barrier” all around your coach to act in reverse of protecting you and those in your coach should God forbid you get into an accident?
An interesting observation last week while driving from the Texas hill country back to Dallas - newly installed guard rails along various places of SH-281 - with orange traffic cones at each end and along the length of the guard rail.
And another observation - orange signs indicating ahead of a damaged highway guard rail - indicating “Guard rail damage ahead”.
Who in their right mind gets any value out of that sign - surely they don’t think “I better not have a wreck there because the guard rail is damaged!”.
My point to all of the above - primarily when it comes to the dash wiring but may apply to the engine bay as well - tie wraps are cheap, they’re reliable. If you wiring is a rats nest, which typically they are under a dash - then get some tie wraps and tighten up the rats nest. Search for wear points and insulate those points with some good 3M/Scotch electrical tape, placing flexible split wire conduit around those places that might chafe wires.
In the engine bay - Make sure all your fuel lines are secured in place. Inspect the engine bay on occasion to make sure a small leak hasn’t developed that could easily turn into a big leak.
Do the same for all the wiring that you did under the dash.
In the end, fire extinguishers are not preventative, the are reactive. You want to head off and prevent any source of fire before the fire breaks out.
If coaches were as prone to fire as to the level of protection that your suggesting to add, then I would think there would be burned out coaches strung out all along the highways.
That’s just me.
We now return you to your regularly scheduled program.