>Make sure it's one of the 7 inch (175mm) grinders. You will eat up a gross
>(144) of metal cutting disks with a 4.5 inch (112mm) grinder.

I cut the nose of a Vanagon once with a Sawsall.

Only took 1 1/2 blades, although a cutting torch would have been much faster...

check out http://www.californiavan.com/nonose/ if you want to see a
cross secction of the Vanagon floor/frame.