Very nice customs, Ben, they look very smart and very American. The hose, I think, looks especially good and the idea of painting the fire extinguishers silver to create watercans is a good one.
What you say about UK fire engines is correct. Rolls of hose are carried in the side lockers and the pump is mounted at the rear. Side mounted pumps were in fashion to some extent when wheeled escape ladders were carried as if the pump was at the rear the escape had to be dismounted to operate the pump and this took time and, of course, meant that the escape had to be parked somewhere, not always easy in, say, a narrow city street.
BTW, what else do you have on top of the pump?