From JK - "They should have a purpose built firefighting rig !!! With a water cannon plus other hoses to speed the fire fighting effort. When they all have to exit out of a pickup bed valuable time is wasted while the driver is in danger !!It's time to design and build a vehicle dedicated for drag strip safety...!!"
An excellent idea - I passed it by my father-in-law (a retired Fire Chief, now a NJ Fire Commisioner, in charge of purchasing fire equipment). The water cannon requires a large tank and high pressure pump that might require a separate engine. So . . . you are going to wind up with a large truck that cannot accelerate quickly and is not very manuverable. Also, he felt that since fire vehicles with enclosed cabs are to protect firefighters on the way to a fire, it is more efficient for Safety Safari members to exit from an open pickup bed. In addition, they have a better view of the situation when approaching the accident.
I'm not throwing cold water on your idea - just bringing up some things to consider from an expert. As far as I know, no racing series in the world has such a vehicle - if there was a practical solution, you would think F1 (where litterally billions of dollars are spent) would have one. I would be VERY interested to hear from Safety Safari members if there has ever been any consideration on developing such a vehicle. Again - an innovative idea, just seems to be a conflict between firefighting capabilities and response time.