The trucks we used had 1100 gal tanks. 800/300 split.
PTO driven John Bean Pumps
The reels actually looked like the electric Hannay Reels but they were belt/pulley driven by a shaft that ran the length of them that was connected to the PTO Shaft by a pulley as well.
My truck LR-3 ("LR" stood for Little Rock) was an International 6 speed standard with a "split" rear end. It scared the holy crap out of me a couple of times on some extreme inclines when fully loaded.
"The Poor Fish" circa 1930's: The Poor Fish wouldn't have been caught if he'd known enough to keep his fool mouth shut.