Now from Redwood House Labs comes the Trailer Tester™! For the first time, you can test your trailer lights and brakes solo even without your vehicle

Now from Redwood House Labs comes the Trailer Tester™! For the first time, you can test your trailer lights and brakes solo even without your vehicle

Now from Redwood House Labs comes the Trailer Tester™! For the first time, you can test your trailer lights and brakes solo even without your vehicle! #shantyboat #madscientist #diyelectronics — at Felton, California

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