Yes there are sails on trawlers, I have seen them,
they are really never used for propulsion as they need to be sheeted flat and tight to work for steadying purposes,
not all have sail tracks as they are just hard sailcloth in a triangle to fill the space flat,
they do work on some boats in some conditions,
they can be rigged to be relatively easy to use but yes some work always required,
yes most boats with stayed masts and booms were probably designed and built to handle a steadying sail ........
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