The Soviets, and by extension the whole Warsaw Pact, loved multiple rocket launchers. This dated back to the Soviet use of Katyusha artillery rockets in WWII:
This sort of artillery, while not terribly accurate, is normally quite devastating because it totally saturates a given area and launchers are normally used in fairly large numbers, all operating in concert.
Here's my battery:
When fully loaded, the rear of the launcher tubes are covered with an orangey-red cap which I imagine contains the primer for the firing mechanism:
R. Mark Davies, who is one of the real gurus of what army used what during the Cold War says that Grad batteries used 1V13 vehicles for their forward observers:
And here's mine:
So, I'm beginning to feel a bit better about my East German artillery, but I still have more to do before I'm satisfied. See you next weekend, if not before.