One innovation that Carpenter introduced during this period was a change to the design of its "Crown RE", mounted on a Spartan Motors chassis. The Crown RE was the first rear-engine school bus to feature an option of a conventional rear emergency door instead of an emergency exit window typical on rear-engine school buses. To make this possible, the floor was slanted up in the last few rows in order to gain height over the engine compartment. Crown by Carpenter also produced a delivery truck loosely derived from its "Cadet" Type B school bus line.