The Jeep Gladiator was a full-size pickup truck based on the SJ Jeep Wagoneer SUV. It was introduced in 1962. Gladiator designations were: J200 for short wheelbase trucks up to mid 1965 followed by J2000; J300 for long wheelbase trucks up to mid 1965 followed by J3000; and J4000 which was the first model with the longer 131-inch (3,300 mm) wheelbase.
Gladiators were available in RWD and 4WD with a solid front axle or independent front suspension, with the optional dual rear wheels in configurations such as cab and chassis, wrecker, stake bed, and chassis mounted campers with extended wheelbases (see the Dually Registry listed in the links below for more information). Variations on the bed were: Townside, Thriftside (a "stepside"), and stakebed. The Gladiator name was dropped after 1971, after which the line was known simply as the Jeep pickup with J2000 and J4000 models until 1973 then J10 and J20 from 1974 to 1988. Military versions of the Jeep pickup included the M-715 and M-725.