We did the Oswego and Erie canals with our lagoon
42. We laid the mast on the starboard side. Above the rails. I built 2 supports, one at the bow and one at stern. Lashed it down well, and it didn't move.
We also kept the sails
and lazy bag on the boom, and used their mast crane to reattach. It was fairly easy and quick dropping and standing the mast. Drop in Oswego, and raise in hop-o-nose marina.
We liked docking
and dealing with locks on port side and never had a problem. There was one lock in the erie canal that we were only given the option of port side. I assume north bound it would have to be starboard, I don't remember which lock though.