That system was available in the USA. I heard about a couple Camanos that had it installed. Rather than running at a certain speed to get 60 Hz, it was an inverter system similar to the popular Honda portables.Why not fab up some brackets and belt drive it off the main engine, very popular in Europe, you can spin it all the time or magnetic clutch, you will nead a hertz meter for the proper rpm. Craig
I corresponded with a guy who was willing to sell me a system but in the end, I decided not to go with it. Installation is somewhat complicated what with the brackets and belts.
Fire trucks and such use that system to provide electricity at fire and accident scenes.