Our boat trailer plans feature the most modern, up-to-date, and technologically advanced features available to give you a boat trailer that’s equal or superior to. Home | gallery | plan prices | boat interiors | books | the captain | brokerage. please note: the following profiles do not represent all of our stock designs.. Mackay supply a comprehensive range of boat trailer parts. you will find everything you need here to keep your boat trailer in top condition. mackay supply only top.