The problem isn't with the truck being able to pull the weight it is the
weight distribution which is too much for the hitch and could cause it to
break (sending all your goats and perhaps even some relatives over a cliff
somewhere).
By the way since you are going to chop your Vanagon up to make it into a
trailer does this mean that you will be leaving the Vanagon list (I mean is
this your only Vanagon?  You won't be needing the List to help you work on
your Ford pickup.)?
Just wondering.
Ken Wilford
Van-Again
John 3:16