Frank, the yellow machine you have is a Cub Cadet, if it's an older one from the 70's it's a very very good machine. I have a 1976 1450 Hydro Cub, weighs easily a 1000 lbs, has a rear axle bigger than my truck. Big Kohler single cylinder engine.
There's a local guy with the exact fire truck you are talking about. A heavy duty four wheel drive pickup with the water tank, a reel full of hose. Looks to be a very heavy duty unit. Also probably get's 8 mpg.
What I want to know is when the USCRA is going to get a "HQ trailer". Picture this...an 8x12 enclosed trailer. In this trailer is all the paper work, a computer, t-shirts, trophies...all the crap needed by a race director and support staff. Either it sits at NHIS all the time, or gets towed to races by the race director. It parks in the same place at every race. Everyone knows where it is, and they go there to get the info, talk to the director etc etc.
It's late and I'm just throwing stuff out there.