In 1975, we developed and built our first self-unloading feed, seed and fertilizer belt trailer. The revolutionary “Eagle Bridge” design concept, introduced in 1977, established Trinity Trailer’s national reputation for excellence and innovation. Our unique frameless design provides superior strength with light weight. It’s a brilliant combination that has stood the test of time. Trinity Trailer’s “Bridge” design and construction provide a number of benefits unavailable in conventional self unloading belt trailers. Flexibility means our trailers can withstand rough, demanding conditions without structural damage. Strength without mass means our trailers are durable while maintaining an overall lighter weight. Versatility means an “Eagle Bridge” Trailer can haul a variety of payloads. Whether your application calls for a carbon steel, a stainless steel or our rugged Agri-Flex trailer, all Trinity Trailers can be configured to meet the needs of virtually every bulk hauler.

Company details

7533 S. Federal Way , Boise , Idaho 83716 USA

Locations Served

Business Type:
Industry Type:
Market Focus:
Nationally (across the country)

This company also provides solutions for other industrial applications.
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Trinity Trailer Mfg., Inc.® began designing and building self unloading conveyor trailers in 1974. With agriculture as the primary focus of our business, we excel at designing and manufacturing conveyor trailers and truck beds. Our focus was and continues to be the perfection of the Eagle Bridge Design.

With a workforce second to none, our strength is in our people and in the design of our trailers. We pride ourselves on our ability to meet the needs of any customer requirements.

Our engineering department can create solutions in days. Utilizing the latest in Computer Aided Design and backing up the design with Finite Element Analysis, engineering can assure that only the very best goes into our trailers.

The Trinity Trailer Mfg., team is the best in the industry.  This highly skilled and motivated group of individuals strive daily to improve upon a product and process that truly is world class. 

Our customers have come to depend on our ability to create specific products to meet their needs. Trinity salesman are experienced and eager to assist our customers match the right set of trailer options to the right application. We welcome any custom requirements that are needed to fulfill our customer's satisfaction with their trailer.  If you have been told 'I'm sorry but we don't build that.' or 'That is an option that we don't currently offer.', then give us a call.  We would be happy to assist you in any way we can.