[McPhail's of Harriston - New & Used RVs Sales, Service, and Parts in Harriston, ON, near Owen Sound, London, Hamilton and Mississauga | McPhail's of Harriston McPhail's of Harriston is an RV dealership located in Harriston, ON. We sell new and pre-owned RVs from Jayco, Eagle, North Point, Octane, Seismic, Montana, Open Range, and Cougar with excellent financing and pricing options. McPhail's of Harriston offers service and parts, and proudly serves the areas of Owen Sound, London, Hamilton and Mississauga.]