I am still in development of MadCar. Now it supports multiwheels vehicles, trailers, bikes.
But, unfortunately, it isn’t free now.
http://www.youtube.com/watch?v=zxF-4s5C76k
http://www.youtube.com/watch?v=z9gNRxNitZM
http://www.youtube.com/watch?v=sgYXBeHRqY8
http://www.youtube.com/watch?v=4J_0-gt3OXk
http://www.youtube.com/watch?v=j8CW2hH5hvQ
http://www.youtube.com/watch?v=NCY9LQ6lGVE
http://www.youtube.com/watch?v=a7TI-afxhL0