Crank It!!
A crank up is absolutely the way to go; if I was building a new dock. But, I have a very nice 'non-crankable' deepwater 35ft. aluminum dock, a boat lift, and a floating jet-dock.
I didn't want to get involved in redesigning the dock so it could be cranked up; it probably isn't even feasible from an engineering point of view. Besides, I hate mig welding aluminum ... pain in the butt. The boat lift is just too massive/awkward to move out of the water. The jet-dock handles the ice fine ... but it gets 'bubbled' anyway.
I felt that the linear air compressor was the most cost effective alternative to a crank-up.
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