I got a Hi-Mountain Summer Sausage Kit and a Hi-Mountain Bologna Kit for Christmas (how did Santa know?). Made 15 lbs of the Summer Sausage the other day, and smoked using 2 oz. hickory and 2 oz. cherry. Turned out very tasty. The 20" casings were a tad long for my sm55, but they didn't quite touch the shield.
I would highly recommend the Hi-Mountain Summer Sausage Kit to anybody interested in making Summer Sausage. It's another good way to use your deer burger (I used 12 lbs deer burger and 3 lbs of ground boston butt for my batch).