Following my comment in another thread about possible PTO use on the water tank trucks, both the 200 gallon (on 15cwt chassis) and 350 gallon (on 3 ton chassis) had PTO driven pumps in addition to the hand pumps but I don't think the PTO used matches the one being discussed here. The water trucks used a PTO that had the driveshaft leading to the rear and seem to have had both the engagement control and the control leading to a governor to prevent overspeed of the engine driven pump leading forward.
See the attached PDF file for the general layout of the water pump PTO.
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