A method includes in a first mode of operation, controlling a front electric linear actuator and a rear electric linear actuator of a lift device such that both a front axle assembly and a rear axle assembly are permitted to rotate relative to a chassis about a longitudinal axis through a first range of motion, and in a second mode of operation, controlling the front electric linear actuator and the rear electric linear actuator to limit rotation of both the front axle assembly and the rear axle assembly relative to the chassis to a second range of motion smaller than the first range of motion.

A telescoping crane has an adjustable, pivoting payload, and a counterbalance mechanism that automatically compensates for the position of the telescoping crane and movement of the payload relative to the crane.

A photographing system for an ultralow-height counterweight-free vehicle-mounted jib, comprising a base (10), a rotating part, a jib, and a damping part. The rotating part comprises a housing (1) provided above the base (10), a frame (37), counterweight blocks (36), a servo electric cylinder (35), a motor (38), a pinion (40), and a large gear (41). The servo electric cylinder (35) is connected to a rapid abutting structure (2) by means of a clamping member (43). The rapid abutting structure (2) is connected to the jib. The other end of the jib is connected to a gimbal camera mounting plate (6) by means of the damping part. The damping part comprises damping springs (8) and a universal joint structure consisting of a pitch damping rod and left and right swing damping rods. A air spring (34) is provided between the frame (37) and the clamping member (43). One end of the air spring (34) is connected onto the clamping member (43), and the other end of the air spring (34) is connected onto the frame (37). A jib body is driven by the servo electric cylinder to perform a pitch motion, and the weight carried by the front end of the jib body is balanced by the air spring, so that the system is counterweight-free.