T hese boat trailer plans cover the latest in axles, wheels, hubs, trailer 2000/3800-pc plans: for twin hull boats such as pontoon boats and power catamarans 18. Tri hull boat trailer plans. posted on 09.26 by cudio. do specifically tri hull trailer tri hull, glastron tri hull boat & trailer. Tri hull boat and trailer boats for sale. 1-15 of 420. this is a 1979 ozark 17 foot tri-hull boat with a 140hp i/o mercruiser stern drive with tilt and trim..