Well I did go look it up and here is what it says................
Do I Need a Chauffeur License?
A chauffeur base license is required when a person is:
„Ï Employed for the principal purpose of operating a motor vehicle or combination of vehicles with a GVWR or
GCWR or GVW or GCW of 10,000 pounds or more.
„Ï Operating a motor vehicle as a carrier of passengers or as a common or contract carrier of property.
„Ï Operating a bus, school bus, taxi or limousine.
„Ï Drivers operating vehicles singly or in combination with a GVW, GVWR, GCW or GCWR of 10,000 pounds or
more must meet the commercial driver medical requirements (including possession of the appropriate medical
card or medical waiver).
If required, the CDL group designator and CDL endorsements are added to the chauffeur base license.
I do not know you situation but with the facts as I have stated them you would not need a chauffeur license. This guy is employed as a plumber. To need a chauffeur license you need to be employed for the principal purpose of operating a motor vehicle. In other words your only job is to drive the truck.