HAND ASSEMBLED IN THE USA
Check N Tow is a shop-grade, battery-powered trailer light tester
built for fast, accurate diagnostics, without hooking up to a truck. Test 7-way RV blade and 4-way flat trailer lights, activate multiple functions at once, and simulate real vehicle signaling including brake override and turn flash.
Serviceable Design
1-year limited warranty
30-day satisfaction guarantee
Hand-assembled in the USA
Test Trailer
Lights Anywhere
No Tow Vehicle
Needed.
THE PROBLEM
Stop tying up a
tow vehicle just
to test lights.
Cheap test boxes might check basic continuity, but real diagnostics demand more. You need to simulate how a vehicle actually drives the trailer, turn flash, brake override, multiple functions firing together.
Check N Tow was built for shops, techs, and fleet owners who need something stronger, more useful, and easier to keep working, without ever climbing into the truck cab.
THE SOLUTION
Built for real trailer testing.
Whether you work on RVs, utility trailers, equipment trailers, fleet trailers, or campground units — Check N Tow gives you a faster, smarter way to verify every circuit.
7-Way & 4-Way Plugs
Test RV blade and flat trailer plugs from a single tester.
Multi-Function Testing
Run multiple light circuits at the same time for faster inspections.
Real Vehicle Signaling
Simulate turn flash and brake override exactly like a real tow vehicle.
Built to Last
Automotive relays, flasher relay, and circuit protection, serviceable, not disposable.
LED + Incandescent
Works flawlessly with both modern LED and legacy incandescent trailer lights.
Tool Battery Powered
Snap in your Milwaukee M18, DeWalt Type 2, or Snap On battery and go.
WHY IT STANDS APART
Smart,Rugged,
Ready when you are
Built for fast, one-person trailer light testing -
in the shop, driveway, campground, yard, or job site. Plug in your trailer, connect a compatible tool battery, and control each lighting function from the tester. No truck. No helper. No wasted time.
Test 7-way and 4-way trailer plugs
Run multiple light functions at the same time
Simulate real vehicle signaling, turn flash, and brake override
Built with automotive relays, a flasher relay, and circuit protection
Works with LED and incandescent trailer lights
Designed to be serviced instead of thrown away
WHO ITS FOR
One tool. Every kind of trailer.
RV Owners
Verify every circuit on your camper before the trip.
Utility & Equipment
Quick walk-arounds on landscaping, construction, and hauling trailers.
Fleet Maintenance
Diagnose and document trailer lighting without ever needing a truck bay.
Dealers & Shops
Pre-delivery inspections, warranty checks, and rapid turnaround.
Campgrounds & Yards
Service rentals and stored units on-site, anywhere a battery can go.
DIY & Restorers
Rebuild and rewire trailers with confidence — every signal verified.
THE PROMISE
Our goal is simple: make this the last trailer light tester you ever buy.
Serviceable Design
Repair and maintain — no disposable electronics.
1-Year Limited Warranty
We stand behind every unit we build.
30-Day Satisfaction
Try it. If it's not right, send it back.
Made in USA
Hand-assembled and tested in our shop.
WHAT OUR CUSTOMERS ARE SAYING
James R. – Trailer Owner
This tool has saved me so much time. I no longer have to hook up my truck just to test trailer lights. It's simple, reliable, and works exactly as advertised. Every trailer owner should have one
Mike T. – RV Service Technician
We use Check N Tow daily in our shop and it has become one of our most valuable diagnostic tools. Fast, accurate, and built tough enough for professional use. Highly recommended.
Steve D. – Mobile Mechanic
I was impressed by how easy it is to use. Within minutes I was testing brake lights, turn signals, and running lights without needing a tow vehicle. It's compact, rugged, and extremely convenient
Frequently Asked Questions
Do I need a tow vehicle to test trailer lights?
∨
No. Check N Tow runs entirely off a tool battery — Milwaukee M18, DeWalt Type 2, or Snap-On — so you can test every circuit without a truck connected.
What trailer plugs does it work with?
∨
Both 7-way RV blade and 4-way flat connectors, from a single tester.
Does it work with LED and older incandescent lights?
∨
Yes, it's built to work flawlessly with both LED and legacy incandescent trailer lighting.
Can it simulate real turn signals and brake lights, not just check continuity?
∨
Yes. It runs automotive relays and a flasher relay to simulate actual vehicle signaling, including turn flash and brake override — not just a basic continuity check.
Is it durable enough for daily shop use?
V
Yes. It's built with automotive relays, resettable circuit protection, and a serviceable design, and it's hand-assembled in the USA with a 1-year limited warranty.
What if it's not right for me?
V
Every Check N Tow comes with a 30-day satisfaction guarantee.
Questions before you buy?
Ask about batteries, compatibility, or warranty