Hard to believe it isn't worse than that. I would do a quick repair to seal it up, then do a proper repair at the end of the season.
Buy some fiberglass resin & hardener and some white color, mask it off, mix it up and paint on a couple coats.
Get your supplies here. They are less than half the price than getting this from a marine dealer.
Your choice 14" - 5 lug trailer wheels
$79 Each - Free Shipping
ST205/75R14 Kenda Loadstar radial trailer tire
$94 Each - Free Shipping
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CARBURETOR REBUILDING - $125 + PARTS
LED trailer lights, Hubs, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts