As best I can determine, in MA the electricians board does NOT require marking of any kind on a truck. They DO require a license number be displayed ONLY IF you put your name on the truck. Though I will say of the 20 people I have asked, 15 have agreed with this and 5 feel there IS some sort or requirement or regulation that requires truck marking, and at least 1 of the people I asked worked for the board of electricians!! Wouldn't ya think this would be an easy question to resolve?? I say majority rules.
Bill