You would have to tow a launch barge built on maybe a pontoon boat. This would launch a hobby missile on the order of the 1600 pound one in the Youtube video. However, getting the platform stable enough to do the launch would be real sketchy. But I think this missile was far larger than 1600 lbs.
Da-boat-a-us
(Chicago-ese for “The both of us.”. It means ‘agreement’)