The new seasonal crank ups are pretty solid. If you feel that your location is that prone to wind and waves I would look at going with a permanent piling dock. You will only get 30' of length unless you have shallow water, and would have to circulate it in the winter, but it is cheaper than a crank up and stronger.
As far as an aluminum pipe dock, I would not recommend it in rough, exposed areas.
We had a permanent crib dock and loved it, with our new property we have a crank up as it was already there.
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