- 1). Park the boat combo trailer on level ground.
- 2). Place the tip of a measuring tape on the back of the trailer where the boat sits on one side. Stretch the measuring tape forward to the boat winch. Hold a yardstick against the boat winch hook and down past the trailer frame. The measurement where the yardstick and measuring tape meet is the size boat that will fit on the trailer.
- 3). Measure the width of the boat trailer rear from one side to the other. This is the maximum width boat that will fit on the combo trailer.
- 4). Measure the personal watercraft area from the flat part of the rear to the winch on the front. Hold a yardstick up to the winch and stretch the measuring tape past it. The combined measurement is the length of personal watercrafts that will fit on the trailer.
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