[LIforrelaxin]

So the simplest response to the original question is talk to a Real Estate Atty. who is familiar with lake Front property. They have dealt with this issue in the past more than likely.

As others have said, this is really no different than instructing someone to use attic stairs, or clean gutters.

I would also work with the Real Estate Agent, and list the Dock and the need initially to use professional help as a Disclosure.

However at the end of the day, once you have sold the property, how the new owners choose to deal with things like a dock, is really up to them. As long as you have disclosed potential dangers, you have done all you can do.... I can't imaging verbiage like "you must higher profession dock people to install and remove the dock" would be allowed in closing documentation....