Inundator industrial foam tanker apparatus from Ferrara are heavy duty trucks designed to be used as a pumper or as a foam supply unit, with tank size available from 1500 to 3000 gallons. 

You can equip the truck with a simple Edwards foam pump and use it as a nurse unit.  Optionally, you may outfit the industrial tanker with a 3000 GPM industrial or municipal rated pump, complete with multiple LDH discharges and a 4000 GPM monitor with 8” piping and valve.