I'm purchasing this hydrohoist for my tritoon a sylvan 8522 fish and cruise. It is supposed to lift 5500 lbs so I'm good with weight. The seller didn't know the model. He bought it used also. I contacted hydrohoist via their Web today so I won't get an answer until Monday at the earliest I thought someone here might know. I have to convert it and I've been reading about how others have converted. Flat deck vs. Rails.