Looking at the Massachusetts DOT website, a DOT inspection is required for all commercial vehicles. Below is what constitutes a commercial vehicle in MA:
Registry of Motor Vehicle Regulations for Commercial Motor Vehicle Inspections
540 CMR 4.02: Special Definitions
(24) Commercial Motor Vehicle shall mean any motor vehicle which is not a private passenger motor vehicle, antique motor car, motorcycle, auto home, house trailer, taxicab, ambulance, hearse, livery vehicle, or school pupil transport vehicle. A commercial motor vehicle shall include the following vehicles:
There is a long list of what constitutes a commercial vehicle here, but focus on the above paragraph. There are words saying a vehicle with a GVWR of >10,001 lbs shall be considered a commercial vehicle, but it's after the 540 CMR 4.02 definition.
Okay, so an antique motor car is NOT a commercial motor vehicle. The question becomes, is a 1959 5-ton truck an "antique motor car?" According to the MA DOT, it is, as defined below:
4.02: Special Definitions
In addition to the definitions set forth in M.G.L. c 90, § 1. the following special definitions shall also
apply:
Antique Motor Car shall mean any motor vehicle which has been assigned an antique registration plate.
If you have antique registration plates, it's an antique motor car, and antique motor cars are NOT commercial vehicles, so I would say it doesn't require the DOT inspection/stickers. But I'm not a lawer.....thank goodness.
Sorry for the color and the type size, the website I copied this info from came out black on dark green and was very hard to read.
I encourage all people to visit their state DOT/DMV websites and download any pertinent laws regarding antique vehicles. If you do get stopped, having a copy of the law and a good attitude may mean the difference between receiving a ticket or a "Have a nice day" (although you'll probably get that with the ticket, anyway).