For travel, the most important sign will be on the gate of your chipper.
On one lane, people can't get beside you, and on two lanes, its dangerous. From behind, they can stare for a long time.
Someone wrote "we see your trucks everywhere". My friend was told the same thing. Either they remembered the name, or called.
He lettered the sides.
I've gotten few calls off my truck sign on the rear window that I can pinpoint. But what it does, is name recognition.
I had a sign at the end of our lane for 10 years with no phone because the city would not allow the business contact at that location. But my name was allowed.
A lot of people said they knew the name when they saw my ad, due to the sign, and that's why they called.
John had a good idea about the letter size. And that's why the letters on sides are good for the work location.