I will need help determining the best interface from owners of the I2, and the civics, as well as the second gen Prius, once the system is ready.
I settled on the Amp Tyco CPC (Circular Plastic Connectors).
206705-1 Tyco Electronics / AMP Standard Circular Connectors
I will use the size 13- 9 pin standard bulkhead, with mating plug terminated with a strain relief.
The bulkhead connector can have a protective cover, to cover the bulkhead connector when not in use.
Ordered enough for 50 chargers.