Truck signs?

Question

my uncle was telling me about some trucks signs, that they put on they trucks, like their companies, for example his is U.S.A Transport, how they call those signs things, he needs it for one of his trucks.

Answer 1

I think he might be talking about the signs the say what kind of cargo you are carrying, like oil, or gasoline, propane, dry goods, milk, water, things like that.

Answer 2

Magnetite signs ???????

Answer 3

To little info to respond.