We have a 2013 3582RL and tow it with a Chevy 3500HD, Duramax and Allison tranny. It is a short bed single rear not dually. I know there are those that say the dually pulls and rides better than the single but I prefer the single rear. We have a Reese slider in the bed and have only needed to use it two or three time. One time I should have but didn't and paid for it with a popped back window but that was my fault. Oh well, live and learn.
Anyway come to the Fall Rally in Goshen in September and join us. Great group, great info and you even get to tour the plant where your Monte was built.