[newhaul]

The formula usually works out to be two hores per half ton on a full keel boat a trailersailer about half that will work just fine

 

[newhaul]

At 1500 lbs the 4 that came with it would be plenty spend the money on sails or some other upgrades
Here is the factory site for the boat http://www.rlyachts.net/index24.asp
An excerpt from the page Designed to sleep 4, the interior is open and clear of unnecessary bulkheads to provide comfortable living. The midship toilet, galley and icebox areas are convenient and the cabin can be subdivided if required. Auxiliary power is provided by a 4 to 10 hp standard shaft outboard sited in a special well designed to prevent cavitation.