catamaran on great lakes?
The big drawback for cats or tri''s is the docking issue. They can''t fit into most slips. Most multihulls I''ve seen on Lake St. Clare have been trailerable. The hassle of trailering, setting up, then taking down at the end of day does limit their use. Also, I know that that the western end of Lake Erie can produce a lot of slop and chop, that might keep away some multihulls.
You also don''t see many multihulls for the simple reason that there are so many more used monohull boats available and their accomodations below are usually more comfortable than a comparable multihull.