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I'll second Carver Covers. They're good.

I shopped around for extension aluminum poles, three of them, with rubber chair-leg tips, top and bottom. The same quality pole is sold at massively different price points, so look around.

Finally, for my bow, above the anchor locker, I bought a HUGE inflatable ball from Walmart's toy section. The ball sits up there and keeps the cover from pooling water. Cheap, easy, and hasn't shown any sign of harming the boat or cover. Between poles and ball, the cover drapes nicely and water runs off, doesn't pool.