Ride Man where are you ??? I thought it was because:
a) If you look the second belt is much drier, so water doesn't ride up the entire lift and cause slippage.
b) Easier to change tension on two small belts than one huge one.
c) One motor can't drive two boats up the lift at the same time.
I know I am wrong ???
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:) "Did you know this goes up-side down" :)