A material collection system sensor includes a paddle (20) pivotably mounted to a tunnel on a collection container floor. The forward end of the paddle (20) is adjacent a front of the collection container (14) and the rearward end is adjacent a rear of the collection container. A switch (50) mounted to the tunnel under the paddle (20) has an actuator extending above the tunnel that is actuatable by downward pivotal movement of the paddle (20).
