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How Does Height of Trailer Ball Figure Into Calculating Rise/Drop of Ball Mount

Question:

When responding to the question of How to Determine Rise or Drop of Ball Mount needed, you said: “Measure from the inside of the top of the receiver tube to the ground. With the trailer level, measure from the underside of the coupler to the ground. The difference between these two measurements is the rise or of ball mount youll need. If the truck receiver is higher than the trailer coupler, youll need a ball mount with a . If the receiver height is lower than the trailer coupler, youll need a ball mount with a rise. You might not be able to get a ball mount with the exact rise or you need, but as long as youre within an inch or two, youll be fine.” A mechanic friend told me that you also need to subtract the height of the hitch ball usually 2 ½ to 3 inches from the coupler measurement. Is this a more accurate method?

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Expert Reply:

No, because you're measuring from the underside (bottom) of the coupler, most of the ball will be inside the coupler anyway, so the height of the ball isn't really relevant. The measurement method we provide is what the hitch manufacturers recommend, so that's what we go with.

Ideally, the trailer tongue will be exactly level, but that won't always be possible. Being within 1-2 inches is fine, and if you have to choose between being tongue-high or tongue-low, go with tongue-high.

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Mike L

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