David,
I have done a couple of headliner's in my day and it is a bear of a job!
With the length of the Vanagon you will find that it will pucker,
fold,and not go where you want it to, when you want it to. At best I can
see where it will be a two man job. One to pull and the other to fasten.
You have my prayers.
Good Luck,

Terry

85 GL