SH,

I picked up a new cover this year for my 16ft Gregor. Not quite the same boat, but Boaters World in Everett has probably 3-4 different varieties in a dozen lengths and shapes. I bet you could find one that would work for you there that is trailerable and durable. If you talked to Akkings I bet he could point you in the right direction, even if not at his store.
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You know something bad is going to happen when you hear..."Hey, hold my beer and watch this"