I'd guess this is the right place?

However, there might not be many members with first-hand experience.

My local propane gas man has an Advance-Design pickup with a V8 engine in it and it is powered by propane or gasoline (just turn a few levers/volves for a switch). He lives about 30 miles from me, so I have not studied how he accomplishes this. His truck also has an IFS.

He uses the truck as his standard work-vehicle.