The 32' Adco also works on the Sunseeker 3170DS. It is snug, which is good, the wind does not flap it around. I used the same size on my previous 28' and it had about 2 feet extra on the front and back. The wind would whip it around pretty good. It only lasted about 3 years. I expect it will last much longer on this RV. Even if it doesn't, I buy them when camping world runs a really good sale, and it averages out to be about $100 a year. Completely worth it! I don't even bother taping the corners or sharp edges.
One of the things I do like about the ADCO cover is the vents near the roof. I read that some of the other covers would cause the roof to mildew without them. I have never had issues.