Towing with Solera
I am towing a Smart car for two, on four. Base plates are available at Roadmaster Tow Bars for $399. You can install it your self or Camping world will do it. You have to install a Battery disconnect switch for about $30. plus your Roadmaster Tow-bar. I used only 4 electrical connection, because the car is only weigh about 1,600 LB. no need for electrical Brake connection. My wife also drive it. She fines it no referent driving with the towed car or without.
Installation takes some mechanical skills, because the whole front part of the smart car has to be taken off, to install base plates.
Good luck, we not sorry we did it.