I went online to my Boat US policy and found this:

"Liability for Dock Contracts

A BoatU.S. Exclusive – If you signed a contract to dock or store your boat, it may hold you liable for personal injury or property damage -- even if you are not at fault. BoatU.S. offers this unique coverage to protect you from these liabilities the contract may require you to take responsibility for."

So I am covered. If Boat US offers this you can ask you company to do likewise.