I have an '85 Westy that has been vibrating more and more over the past
year at speeds over 50 mph.  I had front and back wheels aligned and
balanced and that had no impact.  I thought maybe the shop did a lousy
balancing job, but I just changed to 16' wheels from Go Westy, (which
are great), and the vibration is unchanged.  BTW, the van has 178,000 on
the original motor, and the shocks were changed at 75,000.  Does any one
have an idea of what to check next?

Thanks
Dave Boan
Maryland