Hi Dave , As far as i am aware ,chamberlain did not make an articulated tractor . This machine was farmer built , using chamberlain 40K backends ..Shows the strenght of these machines .Made for 40 HP , this had a V8 GM powering it .I will check ,as i have other photos somewhere of another couple of them joined together giving 4WD .BigDaveinKY said:Thanks for the photos Ian. Looks like a nice rally. Is that a big Chamberlain articulating tractor in the fifth photo down? Never knew they built one that big.