Many boat owners around Boston winter their keel boats in their backyards, a boat hauler with a hydraulic trailer pulls the boats out in the fall, then launches them in the spring. Works like a charm, given the boat haulers know the ramps and their depth considerations. For example, my boat can only be launched at high tide.
So if the gentleman in question is a boat hauler with a hydraulic trailer who knows the area ramps, it should work just fine, and be considerably cheaper than renting a lift.
Certified...in several regards...