Built by Experience. Designed for Real Work.
Trailer Dr. is an Original Equipment Manufacturer based in Fort Kent, Maine. The company was founded by Bruce Theriault, whose career spans more than 30 years in the forestry and trucking industries working hands-on with semi-trucks, trailers, and heavy equipment.
Trailer Dr. was built from firsthand experience maintaining equipment in demanding environments where downtime is expensive and reliability is critical. The goal from the beginning was to create a diagnostic tool that is durable, straightforward to use, and supported by people who stand behind it.
View the Features & Specs
Trailer Dr. is used in shops, fleet yards, and mobile roadside service operations across a wide range of industries.
Built for the Conditions You Actually Work In
Trailer Dr. is built to perform in real working environments.
- Rugged aluminum cabinet construction
- Waterproof design
- Lightweight and easy to deploy
- Reliable operation in cold, wet, dusty, and harsh conditions
A Practical Approach to Trailer Diagnostics
Trailer Dr. focuses on the trailer systems that most often lead to inspection failures, downtime, and safety concerns. Rather than adding layers of software or unnecessary complexity, the product is designed to help technicians verify performance quickly and confidently where problems are most visible.
Service That Reflects Accountability
Support and service are a core part of the product. Trailer Dr. is backed by a 24-hour repair or replace warranty designed to reduce downtime and keep customers working.
Customer support comes directly from the people who build and understand the product. The focus is on resolving issues quickly and standing behind the tool long after the sale.
Continuous Improvement Driven by Real Feedback
Trailer Dr. continues to evolve based on real-world use. Feedback from technicians, fleet operators, and service providers plays a direct role in refining the product.
Suggestions and improvement ideas are welcomed. The goal is not just to sell a tool, but to keep making it better for the people who rely on it.
Trailer Dr. Trailer Diagnostic Equipment
Trailer Dr. provides a practical solution for diagnosing trailer lighting, air, and brake systems with a single, durable tool. By focusing on simplicity, reliability, and real-world performance, Trailer Dr. helps technicians reduce downtime, improve confidence in repairs, and keep equipment moving.
Trailer Dr. 