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I have a 1976 Sport 15 and 50hp Nissan (550 + 160 + 200 in gear = total 910#). Your weight estimation seems about right to me. I still have the dealer original EZ Loader trailer for mine and it's rated for 1650 lbs (and the axle is rated to 2000#). As long as the total weight of the boat/engine/trailer is <1650lbs it looks like you don't need brakes. I don't have brakes on my setup and it trailers very nicely. Also, the boat was trailered ~900 miles from the northeast to me in NC when I purchased it without problems.