Finally got game pieces! The generic versions of Cargo on Amazon match the real things quite closely. With eyes closed no one could tell them apart.
We tested shooting and collecting with HSV. We varied pressure and compression in shooting, and direction/speed of incoming cargo for collecting. Both were driven 1:1 via CIM (easiest thing to rig up). There are a LOT of subtle details. Watch carefully and see what you can figure out!
Shooter used 4in colson wheels
Collector used 3in compliant wheels and KoP dual-lock strips