No dock is permanent once that ice starts moving. I have a grandfathered dock that is very large and unique so I love having it but the first ice out after purchase (2012) it was ripped apart by moving ice. Fixed it and no problems since but every spring is a hold your breath moment till the ice is gone. If I was starting from scratch I would go with a crank up and avoid the worries. Had one installed by Watermark at my old place and it was great. I believe you are allowed a 40 ft crank up but only 30 ft if permanent so that may be a factor as well.
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