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South Dakota Trailer Company
At South Dakota Trailer Company, we believe every trailer should work as hard as you do.
Formerly known as Sheehan Trailers, we’ve grown into South Dakota Trailer Company, proudly serving customers in Watertown, SD and Sioux Falls, SD — and now across the entire state.
Our mission is simple — to provide South Dakota with trailers built for reliability, strength, and value.
With locations in Sioux Falls, Watertown, Brookings, and Rapid City, we make it easy to find exactly what you need, backed by expert support and friendly service.
We proudly carry top national brands including Aluma, Haulmark, Stealth, Mission, CargoPro, SnoPro, Bear Track, and DCT — offering everything from enclosed cargo trailers to rugged dump and utility models.
When you buy from us, you’re getting the best in performance, durability, and craftsmanship — from people who know trailers inside and out.
Trailer Service
Parts & Accessories
Custom Trailer Builds
Financing Options
Latest Arrivals
Discover the newest trailers on our lot — from rugged dump and utility trailers to premium enclosed and aluminum models.
Each unit is built for performance, reliability, and value, featuring trusted brands like Big Tex, Aluma, Haulmark, and Bear Track.
What Our Customers Say About South Dakota Trailer Company
Real experiences from real customers. See why drivers across South Dakota trust us for quality trailers and dependable service.