This model was ordered because it has a built-in quick visual battery test. With my other trailer, which only has one battery, I always take it out and charge it in the garage. This new Hopkins will make it easier for me to stop guessing. The device is easy to assemble and install, and the connection instructions are simple and clear. I've never installed it and it worked the first time I hit the brakes (trailer off the ground). The trailer has 4 axles, each with 2 wheels and brakes, instead of the usual "toy tractor". I will recommend this device. Good luck John
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