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Today on our 2010 Ford explorer, we're going to show you how to install the SMI Stay-In-Play Duo. This is a proportional supplemental braking system. Its part number is SM99251. The duo is an automatic proportional braking system that never has to be removed, replaced, or reset. It activates when your RV's brake lights go on. The inertia sensor in the towed car detects any deceleration properly… see more >
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