Maximum bumper height = 27” (68.58 cm)
Bumper height is measured from a level ground surface to the highest point on the bottom of the bumper. A horizontal drop bumper may be used and must be at least three inches (7.62 cm) in vertical width; extend the entire horizontal body width; and be horizontal and load bearing.
Maximum body height = 42” (106.68 cm)
Body height measurement is made from a level ground surface to the floor of the cargo area.
Reference: NDCC 39-21-45.1.