The longer dock is 47 feet and required a boom to lift it. The boom collapses for summer and is stored underneath the decking.
The wider dock was actually two separate pieces that were bolted together permanently after they were placed in the water.
When the dock is raised for the winter make sure you attach lines to the shore from the outer end. The lines are to prevent the dock from swinging side to side when it is windy. That will break welds or otherwise put a lot of stress on the dock.
After a lot of years of lifting the decking, recently I have been using a hand truck (two wheeler) to remove and replace the decking. It sure beats carrying them!

k.