I have been aboard dozens of Hunters in my life. While I have seen the kinds of minor hairline crazing that you would expect to see on boats of their ages, I had not seen anything or heard of anything like this.
My recollection is that this is a boat with a vacuum formed skin and a foam backer if I remember correctly. Boats like these need to be stored more carefully than your typical fiberglass boat and so storing with snow in the boat in cold weather is probably an extreme no-no.
This boat has a similar construction to a friend of mine's rowing shell. My recollection is that the skin material is sensitive to solvents other than alcohol and in particular does not do well with ammonia based cleaners or silicone bases products.
The kind of failure that is shown on this boat looks like a total failure of the skin material my guess is that this is due to exposure to a non-compatable solvent. The failure would be aggrevated by the way the boat appears to have been stored with the kind of minimal support that a trailer gives and then full of snow.
Have you discussed this with Hunter? My experiences with Hunter and thier general reputation is that they are known for having reasonably good customer support and should be able to help you figure out what went wrong.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies