When I first got these cameras I installed 1 of 3. They worked great for about a month and then I had connection problems. I thought the distance was the problem, but it turned out that the camera was defective. The seller immediately replaced. I then installed the other 2, so since July I have 3 cameras. I'm very impressed with the cameras. I recently did a 1600 mile ride and only had the occasional misfire that lasted no more than a few seconds. My trailer is 31 feet long and my truck is 21 feet long, so 52 feet is pretty reliable.
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