They all had solid axles with leaf spring suspension front and rear. Many trucks are supported by leaf spring suspensions. The axle was suspended on a traverse leaf spring. The front suspension was independent with double wishbones, transverse leaf spring and hydraulic shock absorbers. The XJ uses a leaf spring rear suspension. Like most pickups, it used a rigid rear axle and leaf spring suspension. It is a conventional design with body-on-frame construction and a leaf spring/live axle rear end. The "diaphragm" common in automotive clutches is a type of leaf spring. The front end used a single transverse leaf spring. These replaced the previous flat steel leaf spring gear. A more modern implementation is the parabolic leaf spring. The vehicle featured solid rubber tyres and semi-elliptic leaf spring suspension. The leaf spring has seen a modern development in cars. The carriage was fitted with leaf spring suspension and metal wheels with pneumatic tires. Krupp models had coil spring suspensions, while Rheinmetall had leaf spring suspensions.