They will likely haul the boat with a lift and set it on the trailer,
rather than back the trailer down the ramp. It can and has been done at
a launch ramp, but it is more typically done at a boat yard.

While at the yard, there may be some removals and modifications needed
to bring the total height of the load down to a dimension that will fit
under most overpasses. In some cases, they remove the flybridge
cowling. Radar masts or arches, radio antenna, etc, all need to be
removed and or secured. If you're lucky, the trucker will apply some
adhesive covering to the more forward parts of the load. Expect the
boat to arrive *filthy*, especially after a winter haul.