Creation of a truck game

I want to create something like this, http://i.ytimg.com/vi/3Qze-26__Y8/maxresdefault.jpg

I've done the truck with Realistic Car controller, but I've no trailer or third axle. My question is , how do I create two pivot points? I need one for the dolly attaching the truck and one for the trailer attaching the dolly. So how do I work this out?

Oh and how do I create the third axle on the truck? wheelcollider doesn't seem to be working in Unity 5?

/Jeremy