Welcome to iboats, Jay
I don't think there is a "typical" 18' CC. There are too many variables. Hull construction, material, fuel capacity, number of batteries, power train, T-top or bimini, single/dual axle trailer, PB& J or Double meat stuffed subs, light beer or full bodied - The list goes on. If you can narrow it down some, then we might come close to a real estimate.
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