Well the P3 was one of the Jeeps the border troops used.
Another one was the UAZ 469:
Before that the GAZ 69 was used:
The Trabant 601A (called Kübel or Stoffhund) wasn't a jeep at all:
The W50 was, as you said, a 5 ton vehicle:
The Robur was a 3,5 ton vehicle.