Wherever you mount it internally, it's a great idea when on the trail to strap it onto a bumper in plain view. In a panic, having it on the outside of the vehicle is good for fast access to both you and more importantly to other people. Also if you've rolled and the truck starts smoking while you're stuck inside however briefly, others can manage the fire while you focus on getting out.
Putting it on the roof is highly visible but obviously a roll over can make it unusable for you just when the battery is shorting on the hood and fuel starts leaking.... Bumpers are a great spot.
For a semi permanent internal mount, I've always felt an extinguisher should be accessible directly to the driver. On the floor behind the center console would be my choice, and the mount should be uber stout since in an on road collision that thing would be a missile. Cargo area would be second best, and I'd mount it high so less chance cargo is going to block it.
DougM
DougM
That's a great idea. I need to get ahold of a fire extinguisher now