They are not the only ones to use the idea of a telescopic boom, ... Volvo Penta is the exclusive supplier of 5- and 8-liter Tier 4 diesel engines for Gradall’s wheeled telescopic boom excavator.

Badger Equipment 470TM telescoping-boom excavator is drivable at highway speeds of 60 mph and, in 4x4 mode, can reach off-road locations. Rectangular boom never pivots, maintaining boom strength ...