Very cool - Do you consider that a type 3? Your overhead may just be looking at the Red Book standard for a Type 3. That's a good set-up, clean and no nonsense. We had a similar pump set-up on a slip-on unit with a 350-gallon tank at the park. It was on an F-350 chassis with a flatbed.23HP B&S Vanguard coupled to a 4-stage Wildfire head via a speed reducer. I don't trust their published numbers at all because I've seen 400PSI static and moved 150GPM at ~65PSI to drain 1000 gallons in about 7 minutes. That is, under ideal conditions with shortest possible hose lengths and a nozzle after every possible wye after every 100-ft length of 1 1/2" hose for a total of I think 9 nozzles each asking 50GPM for a math problem not accommodated neatly by a chart. At any rate, Overhead is concerned all of a sudden that it can't draft fast enough. I don't understand.
A guy and I built a CAFS unit in the mid-90's for the BLM with a 2,000g tank and considered it a tactical tender. It's still in service with ODF out of Grants Pass.