1/14 Tractor Truck Freightliner Cascadia Evolution Kit The R/C model is capable of 3-speed gear changes via a 4-channel transmitter control system. The ladder frame chassis features aluminum side channels with resin cross members, and are equipped with a coupler to enable linkage with any of Tamiya?s semi-trailers. Power from the front-mounted motor is delivered to the rear wheels via propeller shafts. Built-in differential gears enable smooth cornering. The highly-realistic suspension utilizes metal leaf springs and friction dampers.