SMI Stay-IN-Play Duo Towed Vehicle Braking System

Catalog Item # 77119

Nothing to take in or out of the towed vehicle.

Duo senses coach deceleration and uses the signals from the motorhome’s brake lights to activate towed car braking. No unwanted or unnecessary brake activations on grades or over bumps. And it’s all automatic. A patent-pending, palm-sized air cylinder applies proportionate and progressive braking effort to your towed vehicle’s power-assisted brakes.

  • Just turn it on and tow—no set-up required
  • Air pressure activates towed vehicle brake while vacuum energizes the power brake system
  • Hidden installation under the hood of the towed car
  • Completely universal and transferrable
  • Panic Stop Braking -- up to three times the normal effort
  • Simple direct-pull activation – no pulleys

Technical Specifications

12.23 lbs.

Camper's Choice Rating

Reviewer rating of 5 stars based on 2 reviews (5 Based on 2 Reviews)

Add A Review

  • You never have any extras to connect (2)
  • Set-Up is quick and easy (1)
  • My foot occasionally hits the piston mounted on the brake pedal (1)


by Anonymous – March 16, 2017
5 out of 5 stars

I've had this for 5 years, over 80,000 miles. It works great and I have never had any problems. It is easy install for good D

Nothing to do

by Frank – July 12, 2016
5 out of 5 stars

I had this braking system installed and it works great. There are no brackets or plugs to connect once the dingy is connected to t

by Randy – October 19, 2017
The DUO only draws power when it activates. This means that you can tow for several days without concern for your battery.
by Camping World – October 20, 2017
by Buck – April 18, 2017
Yes, the Stay-IN-Play system is compatible with gas and diesel coaches.

The installation manuals and videos can be accessed here.
by Camping World – April 18, 2017

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