Some 19,648 K20 Fleetside pickups of all types were built in 1972, though only 755 were Stepsides. About a third of them were 4x4s. They had an 8-foot bed and the Longhorn option (8½-foot bed with a 133-inch wheelbase) was not available for the K-Series. For the cost of heavier springs (about $20) and higher rated tires ($112-$263 depending on the tire chosen) you could bump up to a 7,500-pound GVW on the K20. Higher GVWs were available on the C20 and C30 (there was no K30 in this era), but 4x4 ratings were deliberately conservative.