Truck-mounted crane
A crane placed on a truck carrier affords the mobility just for this form of mobile crane. Generally, these cranes can travel on highways, eliminating the need for special equipment to move the crane. When working on the jobsite, outriggers are extended horizontally in the chassis then vertically to level and stabilize the crane while stationary and hoisting. Many truck cranes have slow-travelling capability (a couple of mph) while suspending a large quanity.
Great care must be taken never to swing force sideways from the direction of travel, as most anti-tipping stability then lies in the stiffness with the chassis suspension. Most cranes in this type likewise have moving counterweights for stabilization beyond that given by the outriggers. Loads suspended directly aft include the most stable, since the majority of on the weight on the quality crane provides a counterweight. Factory-calculated charts (or electronic safeguards) are employed by crane operators to look for the maximum safe loads for stationary (outriggered) work as well as (on-rubber) loads and travelling speeds.
Truck cranes home in lifting capacity from about 14.5 short tons (12.9 long tons; 13.2 t) to about 1,300 short tons (1,161 long tons; 1,179 t).