Hello Addison -- Welcome to the Forums! Nice job on your Airstream. Blue book values do a very poor job of tracking the quality & value of a vintage Airstream. You need to pursue a declared value policy.
I came up with the following insurance links via searchwords
declared value. See if they don't help you some.
http://www.airforums.com/forums/f161...nce-31909.html Renewing Insurance Insurance
Did you find an answer in there somewhere?