I tried emailing bus boys and it bounced.  I used the address linked to
the web page below.  Anyway, I opffer it here in case someone else may
know...

At: http://www.bus-boys.com/bbaccess.htm
you list:

>Side Step (Reproduction)
>Probably the most popular accessory we've ever done! This beautiful accessory will last as long >as your
Bus or Vanagon because the wide-ribbed anodized aluminum extrusion
allows for a >lightweight, yet very
strong unit that's corrosion-resistant and easy to keep clean. Simple to
>install, the Side Step mounts in the
existing Jack-Holes (drilling is required for locking allen >bolts,
allen wrench is included) and includes
stainless steel hardware for long life, rust >resistance and quick
removal. A must for anyone using their side
door for loading passengers, >groceries, camping gear or just about
anything! Mounts on both sides to allow
safe and easy >access to the roof rack.
>250-08001 Side Step, Vanagon 80-91 $139.00

Do you have weight stress figures/ratings?
--
Please remove "faux." from my reply-to address above in order to send a
reply.  I'll try anything to try and foil the junk email mutants.