30-day trialMoney-back guarantee if you are not satisfied. Learn how Trailer Dr. works.

Trailer Dr.

Electrical & Air Brake Trailer Diagnostic Tool

Compact, handle-equipped semi-trailer diagnostic tool for one-person operation. Verify trailer lighting, air supply, and brake activation from the rear of the trailer. No second person or cab access needed.

  • Remote control of lights, air supply, and brakes
  • Waterproof, rugged NEMA-rated enclosure
  • 15.2 lbs with built-in handle. Move between trailers in any shop or yard.
  • 1-year warranty · 30-day trial (buyer covers return shipping)

Optional Add-On

Rechargeable remote with integrated work light: +$99

1-Year Warranty

48-hr repair turnaround. Support from the builders.

Free 30-Day Trial

Buyer covers return shipping if returned.

Made in the USA

Made in the USA.

Not sure about it yet? See the full specifications and capabilities or schedule a demo and see it in action.

View Full SpecsSchedule a Demo
Trailer Dr. diagnostic tool — Front View

Deployment

Works Wherever You Work

Trailer Dr. brings the test to the trailer, not the other way around. It performs in every environment technicians actually work in.

Shop Floor

Plug into shore power and run full electrical and air brake diagnostics without moving the trailer or calling someone to the cab.

Fleet Yard

Walk the yard and test trailers in line. One technician can work through an entire fleet independently, with no vehicle access required.

Field Calls & Roadside

With a service vehicle providing 115V power and air, Trailer Dr. handles breakdowns and field calls without needing a shop.

Mounted to a Service Vehicle

Mount Trailer Dr. to your service truck. With vehicle air and power available, you have a fully capable mobile diagnostic station. No shop required, anywhere you drive.

How We Compare

More Compact. More Powerful. More Flexible.

Most trailer testers limit what you can do from the remote and require a permanent vehicle mount. Trailer Dr. gives you full control from the rear of the trailer, in any environment, with no truck required.

Trailer Dr.
Typical Trailer Testers
Remote control
9-channel rechargeable remote. Every function at your fingertips from the rear of the trailer.
Limited remote channels. Not all functions accessible without returning to the box.
Full remote operation
All 9 functions operable from the remote. Never walk back to the box.
Requires manual interaction at the box to switch between test functions.
Remote power
Rechargeable. No batteries to replace.
Disposable battery remotes that need replacing in the field.
Vehicle mounting
Not required. Use anywhere with 115V power and an air supply.
Designed for permanent mounting in a service truck.
Size & weight
12 × 10 × 4 in, 15.2 lbs. Carry it between trailers by hand.
Larger, heavier units built for fixed shop or vehicle installation.
Weatherproof
Fully waterproof, NEMA-rated polycarbonate enclosure.
Standard enclosures with no weatherproof rating.
ABS fault code reading
Industry-standard blink codes. Works on all major trailer brands. No software or dongle required.
Requires proprietary software or a separate diagnostic tool.

Capabilities

What Trailer Dr. Tests

  • Brake, turn, running, and marker lights
  • Electrical connections and wiring faults
  • ABS fault code reading via industry-standard blink codes. Works on all major trailer brands. No software, no subscriptions, no proprietary dongles required.
  • Air supply to the trailer (125 lb max, self-regulated)
  • Air leaks
  • Brake activation and air brake response
View Full Specs & Capabilities

Technical Specifications

Built to Perform

Price$3,195, includes shipping within the USA
Warranty1 Year
Free Trial30 days (buyer covers return shipping)
Output30 Amps @ 12.8 VDC, most powerful in its class
External Power Input115 VAC
Air Input125 lbs max air output (self-regulated)
Connection7 Way Round Pin
ControlsManual & Remote
Remote BatteriesA23 12V Alkaline (standard); optional rechargeable remote with work light +$99
Weight15.2 lbs, lightest in its class
Dimensions12 x 10 x 4 in (H x W x D), smallest in its class
MaterialsNEMA 1/2/3/3R/3S/4/4X/6/6P/12/13 Polycarbonate
Overload ProtectionElectronic with buzzer and indicator light

Ready to Order or Have Questions?

Speak directly with the people who build Trailer Dr., or try it free for 30 days.

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