The pump on a Ledwell water tanker is set up to pump around 400GPM at 2000RPM engine speed with about 55PSI at the spray heads.
At this engine speed, you should receive a spray pattern of 55′ wide by 30′ deep and a side spray 65′ to 75’out.
Most PTOs are in the 111% to 126% range. The pump will peak at 2400-2500RPM (pump speed).