Run a fleet of propane powered sweeper trucks (not exactly the same equipment, but same principles). Primary reason for switching was cost savings. Have been running propane for over a year now.
Impact - other than financial pros/cons, none
Refueling - simple, not a problem
Stock - fill up at commercial station near shop
Financial - lower operating cost / mile. average $1 - 1.5 cheaper than gasoline. kit on the truck cost $8,500. based on usage our ROI is 8-14 months.
Increased engine life - oil changes less frequent, oil is a lot cleaner
Repairs - nothing major so far