SmithCo produces the best side dump trailers on the market, with superior stability, easier unloading, and faster cycle times. Gold, iron ore & other mineral mines maximize payloads with SmithCo. We offer heavy haul units for off-road, and our trailers can make it easier to open satellite mines. Side dump trailers work in conditions ranging from desert heat to arctic cold, and can haul nearly any material. When we build trailers, we build solutions.