USI Insurance Services (formally HUB International)
Attn: Chris Johnston, CIC
2375 E. Camelback Road Suite 250,
Phoenix, AZ 85016
(602) 749-4282 (direct)
800-688-7472 ext. 41282 (toll free)
No shipper will cover quilts, even if you pay for extra insurance. This has been researched this extensively. They are one-of-a-kind pieces of artwork, and are excluded in their fine print.
Some shippers (including USPS) have coverage for jewelry or other high end items, but may cover only the materials and labor, or require very specific appraisals based on the artist's previously sold work. If you are the maker, you should have a separate homeowner's policy rider for when the quilts are in your own possession, but most of these policies exclude quilts while in another's possession, like during transit or shows, and may not cover machines, books, fabric stashes, etc.
The policy can cover shows or exhibits, or situations like the Hoffman Challenge. We ask that you insure each item in the collection for $250 each. For example, the 20 quilt trunks would need $5,000 in insurance. Contact Chris for more information.