Several platoons of these would've been assigned to particular rivers, bays, estuaries, etc. to ferry across towed artillery batteries:
As well as general cargo loads, any light or medium truck in the Soviet inventory would fit into the vehicle. The PTS-M was succeeded in 1973 by the PTS-2, which looked basically identical, but was slightly bigger and could handle heavier loads. Like all superseded equipment in the WarPac, the PTS-M never really retired, as production of the PTS-2 never came close to meeting demand.
Now I come to the bone I have to pick with Marcin. The real PTS-M would hold a URAL-375D or a Star-266, as you can plainly see from the photos above. The ZIL-157 would also fit. However, Marcin's models of all three of these trucks will NOT fit into his PTS-M mini. Either his trucks are too big for scale or (as I suspect is the case) the PTS-M mini is smaller than scale. Annoying!!
In any case, here's my platoon of East German PTS-M amphibious cargo vehicles:
More next time.