https://www.firerescue1.com/fire-pro...mLNk_-ZGI0UjyA

The super pumper itself was a tractor-drawn unit that resembled today's recreational motor homes with many slide-outs and pieces of equipment that were engaged once the unit was in position. The routine setup time to get it operational was about an hour.

The super pumper had a commercial Mack truck for its tractor. Its engine was a four-stroke Mack END864 V8 diesel delivering 255 horsepower; an Allison CLT4460 six-speed semi-automatic transmission was equipped for a power take off unit to drive the priming pump and the pump engine's starting air compressor. Additional power take-off units powered the air brake compressor including the power steering pump. The semi-trailer was mounted to the fifth wheel of the tractor.

Mounted at the rear of the tractor-trailer was a DeLaval six-stage pump that had a piston-type valve to allow for operation in either pressure or volume positions.

The central pumping unit alone could draw water from eight hydrants at once, drop lines into bodies of water, supply a mind-boggling number of lines with water simultaneously, and flow over 10,000 gallons per minute at low pressures if the situation called for it. When the pressure was ramped up to 350 psi, it could move 8,800 gpm.
That is a LOT of water! The short video is interesting too.