A crawler traveling device includes a first wheel; a second wheel spaced from the first wheel; a support frame that supports the first wheel and the second wheel; a third wheel disposed above the support frame; an endless crawler wound around the first wheel, the second wheel, and the third wheel; and a vehicle-height changing mechanism that changes a position of the support frame in the vertical direction with respect to the third wheel. The vehicle-height changing mechanism has an actuator that is capable of contracting in the vertical direction and that changes the position of the support frame in the vertical direction with respect to the third wheel.

A crawler traveling device includes a first wheel; a second wheel spaced from the first wheel; a support frame that supports the first wheel and the second wheel; a third wheel disposed above the support frame; an endless crawler wound around the first wheel, the second wheel, and the third wheel; and a vehicle-height changing mechanism that changes a position of the support frame in the vertical direction with respect to the third wheel. The vehicle-height changing mechanism has an actuator that is capable of contracting in the vertical direction and that changes the position of the support frame in the vertical direction with respect to the third wheel.

A vehicle includes a vehicle body, an actuator system, a first track assembly and a second track assembly. The first track assembly and second track assembly support the vehicle body above a substrate. The first track assembly and second track assembly each comprise a continuous drive track. An actuator system is operable to vary the distribution of track pressure along each continuous drive track to thereby adjust direction of travel of the vehicle.

A vehicle includes a vehicle body, an actuator system, a first track assembly and a second track assembly. The first track assembly and second track assembly support the vehicle body above a substrate. The first track assembly and second track assembly each comprise a continuous drive track. An actuator system is operable to vary the distribution of track pressure along each continuous drive track to thereby adjust direction of travel of the vehicle.