Designers and Builders of Specialized Trailers Since 1974

For over forty years, Doonan Specialized Trailer, LLC has been dedicated to engineering and producing platform trailers that meet and exceed the specialized needs of owner operators. Our product lines include custom flatbeds, drop decks, double drops, oilfield trailers, extendibles, and RGN lowbeds. Our Best in Class Dealer Network is committed to helping you with a trailer that fits your specialized need.