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2 words " Quick Release" Grab a mount with a lever you pull for instant release. In an emergency those clamps are horrible. Someone went to a building and got one before I could get mine un-done years ago for a buddies truck on fire.
I also have a Halon HR3 inside, which is the same one in my airplane. Then I have a second one (standard red ABC) in the bed. I just ordered the BuiltRight mounts for the bed like you have pictured. I always carry one, (and many in the house), because I had to use one once to save a kid trapped in a go-cart on fire. (It's interesting how time slows down in those situations).
I would let the mother f#cker burn. Just get another one.
Just keep a fire stick in your truck. $$$, but old fashioned fire extinguishers are, well, old fashioned.
I would let the mother f#cker burn. Just get another one.