Good morning Conrad .
Yes I made a 16 inch gasifier and had it in a 94 Ram half ton 4x4, 5.2 motor. I drove this truck to Argos two years ago.
I tuned or choked the gasifier down to where it would make clean gas at the lower demands ( driving around the farm ) . In effect the gasifier is about the same capacity as a 12 inch after the 16 inch was choked down .
Once the gasifier gets over 12 inch the expense goes up quickly. From now on I will be staying away from anything over 12 inch .
I set the gasifier off the truck temperately as my son is using the truck to drive to school and all the activities around the school . Too much responsibility for a young driver in those areas .