from the photos of the motorhome it appears to me alcan very likely screwed up.
however, accidents happen and the true measure of a shop is whether they stand behind and fix their problems.
the op gave alcan a get out of jail free card by denying them a reasonable chance to fix the problem and just returning them immediately and claiming a refund. that is completely unreasonable when dealing with a custom made product like this. alcan was within its rights to deny a refund.
we really have no way of knowing how they would have handled this if given a fair chance.
it is a nice looking motorhome though.
Except, if you go through the entire thread, I believe the OP actually asked them to fix them, as he had a friend with the same setup that could have used them. Alcan refused that proposal and stuck with, "you didn't call, therefore your options are we keep them, or pay to have Alcan return the springs to the OP." Neither of those are even close to what I would call reasonable given what appears to be a clear defect on the manufacture's side.