> Several extinguishers are great but might be a hazard in a crash if
> mounted behind legs/feet with typical extinguisher mounts. Behind the seat
> pedestals should much better.
> 

"If you are injured by the impact of a three-pound fire extinguisher
breaking loose and hitting your legs in a crash, you have so much more to
worry about than putting out almost any fire."

That was my first thought as well, but I turned it into a Woody Allen movie
scene of sorts ...... I'll likely mount my 2nd, very large extinguisher there.
Excellent spot, quick access, no excuse to head to the back of the van
to "check things out" without the extinguisher in hand, and it's about as
far away from the most frequent vanagon fire source as you can get and
still be inside the van.

My plan has been to cut off the draft/oxygen-air source by spraying up
under/behind the rear wheels, into the engine bay bottom.

Keeping my eyes crossed however ....

bob