A chassis front assembly (12 / 12'), comprising: a front frame member (12a / 12a'); a first wheel assembly connected to the front frame member (12a / 12a') by a first bracket, wherein the first wheel assembly includes a first wheel (W 12b') connected to the first bracket; a second wheel assembly (12b") connected to the front frame member (12a / 12a') by a second bracket (12d"), wherein the second wheel assembly (12b") includes a second wheel (W 12b") that is connected to the second bracket (12d"); an electrical contact assembly (12c / 12c') connected to the front frame member (12a / 12a') by a third bracket (12d"'); a motor disposed within a housing that is connected to the first bracket of the first wheel assembly, wherein the motor is connected to the electrical contact assembly (12c / 12c') by an electrical conduit, wherein the motor is connected to the first wheel (W 12b') of the first wheel assembly for actively rotating the first wheel (W 12b') of the first wheel assembly, wherein the motor is not connected to the second wheel (W 12b") of the second wheel assembly (12b"); and a drag link that connects the first bracket of the first wheel assembly to the third bracket (12d'") of the electrical contact assembly (12c/12c') wherein rotation of one of the first wheel assembly and the second wheel assembly (12b") relative to the front frame member (12a / 12a') drives rotation of the other of the first wheel assembly and the second wheel assembly (12b") relative to the front frame member (12a / 12a') by way of the drag link that connects the first bracket of the first wheel assembly to the third bracket (12d"') of the electrical contact assembly (12c/12c'). a front frame member (12a / 12a'); a first wheel assembly connected to the front frame member (12a / 12a') by a first bracket, wherein the first wheel assembly includes a first wheel (W 12b') connected to the first bracket; a second wheel assembly (12b") connected to the front frame member (12a / 12a') by a second bracket (12d"), wherein the second wheel assembly (12b") includes a second wheel (W 12b") that is connected to the second bracket (12d"); an electrical contact assembly (12c / 12c') connected to the front frame member (12a / 12a') by a third bracket (12d"'); a motor disposed within a housing that is connected to the first bracket of the first wheel assembly, wherein the motor is connected to the electrical contact assembly (12c / 12c') by an electrical conduit, wherein the motor is connected to the first wheel (W 12b') of the first wheel assembly for actively rotating the first wheel (W 12b') of the first wheel assembly, wherein the motor is not connected to the second wheel (W 12b") of the second wheel assembly (12b"); and a drag link that connects the first bracket of the first wheel assembly to the third bracket (12d'") of the electrical contact assembly (12c/12c') wherein rotation of one of the first wheel assembly and the second wheel assembly (12b") relative to the front frame member (12a / 12a') drives rotation of the other of the first wheel assembly and the second wheel assembly (12b") relative to the front frame member (12a / 12a') by way of the drag link that connects the first bracket of the first wheel assembly to the third bracket (12d"') of the electrical contact assembly (12c/12c').