RT90U is equipped with the two-axle loading chassis, which has two types of drive modes, four types of steering modes and backward-forward driving functions. It also has four sections of dodecagon main booms, jib stowed under boom, type outrigger, fixed balance counterweight, as well as three working modes, including: hoisting with the support of outriggers, hoisting with the support of tire and hoisting when driving. It is widely used in oil field, mine, road and bridge construction, warehousing base and other construction sites.