This is the Japanese version of the European one-man hose cart, except that it is on four wheels and accommodates flaked rather than rolled hose. Same idea, different execution. Adding lights seems like a good idea, too.
Heavy pumpers have both a battery-powered ride-on hose cart and a manual one. Light pumpers have only a manual cart. These are very useful in typical narrow alleys in residential and light industrial areas of Japanese cities, which cannot be accessed by vehicles.
guessing, it is a remotely operated vehicle for bomb threats; or perhaps to take a hose monitor (remotely operated nozzle) in.....
certainly, something different to see on the rear of a pumper.
regards, from canada,
pat_r-b
Added by Pat Rivers-Bowerman on 13 November 2008.