Pat,
You might want to go to the Reese web site and print out the page which
shows the various weight spring bars and the selection of same. Then go to
the manager of the CW store and ask him to exchange the spring bars for the
proper rated ones.
Take the position that it was an honest mistake on the part of the sales
person, and that the incorrect one could be a safety issue. [Could cause
instability on a rough road or at the crest of a hill or dip in the road.]
Since the various spring bars are interchangeable, I don't think you will
have a problem.
Good luck, and let us know how you make out.
Oliver Filippi
P.S. If the store gets nasty, you could always threaten to post your story
on the Airstream and vintage Airstream lists. You could even take a copy of
this e-mail with you.