โI just got my CDL less than a year ago,โ says owner-operator Jim Pettus of the name of his 2003 Peterbilt 379, the Young Gun. After someone called him young gun, โit just kind of stuck.โ The 21-year-old Reinholds, Pa., resident hauls regional loads with 525 horses of Caterpillar power and a 13-speed transmission.