Do you have a link for the holder you are using?I went with a normal fire extinguisher in the back. I have it strapped down with a holder that has a zipper on the side for very fast retrieval (I don't want to have to deal with removing 3 straps when I need it, 1 zip and i'm good to go).
Former EMT myself so I always like to have a med kit and fire extinguisher available easily.
Check out the install when I get to the rear of the truck:
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