Man, here we go.
For the boat you're towing, I'd say a 3500 SRW is fine. Dually is nice, but yes, have a car as your daily driver. My opinion,
A question that has been asked a billion times before. I like duallies, but you will have no problems finding SRWs that will do the job with the 311. If you are not looking to step up, a 3500 SRW would be my choice. Personally I like to be on the safe side. It'll never hurt, but a must? No.