Trailer Dr® is an Original Equipment Manufacturer (O.E.M.) by Inventor and Founder Bruce Theriault. Bruce has been involved in the forestry and trucking industry for over 30+ years and has been a leader in mechanics and electronics innovation throughout both industries. Working in and around semi trucks, trailer and forestry equipment throughout his entire lifetime, Bruce has played a key role in equipment maintenance and management for hundreds of companies involved.


Trailer DR has a 24-hour repair or replace warranty policy to ensure that you are never without your diagnostic tool for long. We maintain our excellence in customer service, product quality and durability.

Letter From Bruce

My name is Bruce Theriault and I would like to thank you for your interest in my trailer diagnostic tester. In today's world, we have all experienced the lack of service and consideration demonstrated by many companies after you buy their products. They say whatever they can to make the sale, and then it's like pulling teeth to get any service response out of them. I know this myself first hand and because of this, I want to be sure that your experience with the Trailer DR® exceeds your expectations and that I never disappoint you with our service or customer service response.

To prove my commitment to you, if for any reason you are not happy with my tester, or more importantly, the level of customer service you receive, I welcome you to call me directly at 207-231-4967. Your satisfaction is more important to me than the sale itself. My goal is to have Trailer DR® in shops all across North America and customers like you are the key to that goal. I want Trailer DR® to be different and be known for its quality and service.

With that said, please take a look at my trailer diagnostic tester. You will see how simplicity and innovation combined with durability makes my tool above all the rest. Tools like this will help you do your job faster and better than before. I would also like to invite you to critique our products. If you can think of a better way to make them or changes that will make them work better, please contact me directly and I will be sure to look into it. If you have an innovation and would like some feedback, give me a call.

I thank you for taking the time to review our product line and wish you and your family the very best of everything.

Bruce Theriault

Inventor / Owner

Trailer Dr®