hi everyone . i just bought a used 6000 pound shorelandr trailor with the tandem axle trailor . it is for our 1989 thundercraft 220 magnum that we just bought . my question is the trailor had no bunks or rollers on it and the brackets were gone to . i would like to put bunks on it , but i am not sure how many . i see some big trailors with 2 bunks and i see some with 4 bunks on it , not sure what to do . the boat weighs 3500 pounds i was told . any ideas what i should do ? thankyou ..