Try to think of hopper extensions this way. Hopper extensions are intended to help get to the end of a field or assist in a few cases where you need some extra grain capacity. They are not intended to provide continuous, additional grain tank capacity. If a situation does arise where the machine is loaded with an additional 90 bu of corn (approximately 5,040 lbs),the operator must use common sense and realize he cannot cross 3 ft. deep ruts and rough waterways without a little care.