Indiana Code Title 6. Taxation § 6-6-1.1-1202

Sec. 1202. A vehicle which transports gasoline on a public Indiana highway must have the name and address of the person, firm, limited liability company, or corporation transporting the gasoline on both sides of the driver's compartment.  The information must appear in letters at least six (6) inches high with a stroke at least three-fourths ( 3/4 ) inch wide and in a color contrasting to the background on which the letters are placed.  However, a distributor licensed in Indiana is not required to display his name and address on transportation equipment if the equipment is identified with the trade or product name or insignia generally used in identifying such equipment, and the name or insignia is well-known throughout the area in which the equipment is operated.