OPERATING A MANTRIP, PUSHING A DISABLED GOPHER TO THE GOPHER SHED AREA (APPROX. 100' AWAY). EE LET OFF THE TRAM OF HIS MANTRIP TO ALLOW THE GOPHER TO ENTER THE SHED AND AS HE DID, THE FRONT WHEEL OF HIS VEHICLE HIT THE TRAILER HITCH ON THE GOPHER, CAUSING THE STEERING WHEEL TO JERK & THE STEERING KNOB ON HIS VEHICLE STRUCK THE SIDE OF HIS RIGHT HAND.