For 2003, Isuzu released a conventional-cab truck, named the Isuzu H-Series. Intended largely for vocational use, the Isuzu H-Series was marketed as a competitor for the Hino 600 and Freightliner M2. Based on the Kodiak/TopKick C6500/C7500, the H-Series differed solely in its grille design, sharing the 7.8L Duramax inline-six with the C6500/7500 and the Chevrolet/GMC T6500/7500 (based on the Isuzu Forward).
