G. Priest Services Provides Full Site Servicing, Large or Small Backed by Our Own Gravel Pit Supplying Quality Aggregate Products. G. Priest Services Inc. is a family owned trucking company based in Minesing, Ontario (just outside of Barrie, ON). In 1946, Del Priest began trucking grain and livestock in Ontario and Eastern Canada. Four generations later, G. Priest Services Inc. now specializes in Construction, with a growing fleet of aggregate trucks ranging from 21-42 tonne payload.