sail for salmon troller

[Loudwhistle]

I'm thinking of buying a small sail for my 42' salmon troller. I draw about 6 feet and my beam is 14'. I have a boom that runs from the back of my cabin (about 20' long) and I would like to get a sail that would attach to this boom and then go up my mast which is about 20' high as well. Never been sailing and don't know a thing about sails. I was hoping to employ this sail on long runs when the wind is favorable and also be able to collapse the sail when it isn't needed. I'm hoping to find something that is not to difficult to put up and also improve my fuel economy. I've read a little on steading sails and at times it sounds like these would help steady my boat on the ocean when there is a breeze. Any information as to size to get, practicality, strain on the rigging, cost, where to buy one, etc would be appreciated.

Thanks

[Geoh]

Check out this site http://www.dieselducks.com/sail-backup.html

George