Karl,

I towed a diesel Westy about 600 miles a few months ago.  I towed it on
its wheels and this worked out very well.  I was able to cruise at 70
mph on the interstate with no handling problems.

Just be sure to allow more distance for brakeing and be very alert for
large vehicles passing.  Semis move a great amount of air and you can
feel it as they pass.  I found it helpful to drive to the exterme right
as they passed so I felt very little of their blast of air.

Remove the half shafts if it is auto and be sure to use neutral if
manual.

I heard a story about someone towing a vw bug with a rv.  Seems it was
left in gear and eventually destructed resulting in engine fire.