Just installed the smi stay in play duo on my Jeep Wrangler unlimited prior to a 1000 mile trip, and I HIGHLY recommend it! It's a very detailed and involved install (I have a friend who is a talented mechanic who helped me), but once you get it installed, you hook up your toad to the tow bar, flip a toggle switch located in the toad, and you're on the road. While it is the first and only braking unit I've used, I can't imagine another system being easier to use...or more safe. It is an inertia based system, meaning the harder the coach brakes, the harder the toad brakes. A++
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