I have used a dolly, same one, for 30 years or more behind several Cs and DPs pulling several different cars. Have had Smart cars since 2009 and got our last one set up with a Roadmaster tow bar, wired in lights, electric cut off, everything! I used it twice. That thing takes 3 times as long to hook up and unhook then there is the steering wheel wobble! No thanks. I have never had brakes, I guess that is up to you. I forget the name of my dolly but will put it on here after while. In all these years I have had to unhook it once in a campground.