We pulled our 2009 Smart Fortwo Passion behind our 5th wheel and our Class A. Used a Brake Buddy Classic for supplemental braking. Worked great and you can move it from toad to toad as we have (Jeep Grand Cherokee, Ram 1500 to our current 2009 Mini Cooper Clubman S). It's only let us down 1 time in the 9 years we've had it, then a compressor fitting broke inside, sent into Brake Buddy for repair ( cost us about $100) and was sent back within a 2 week span. Make sure you follow the towing instructions for flat towing your Smart, you will also need to install a battery disconnect (I used the one with a red key and hide it in the glovebox, easy to install sense the battery is located under passenger floorboard), Out of site out of mind.