SmithCo’s side dump trailers can change your mine. A tractor-trailer combo can reduce ton-mile costs compared to a conventional haul unit thanks to its smaller footprint and reduced haul-road requirements, lower fuel use, longer tire life, and lower-cost maintenance. Our custom mining and quarry trailers are at work around the world. Ready for highway or off-road driving, side dump trailers make opening satellite mines more feasible. Payloads of up to 100 tons per trailer; 200 tons with trained trailers.