The tongue height of your trailer is going to increase in relation to the amount of lift gained from the Dexter Trailer Springs Over-Under Conversion Kit part # K71-385-00 for 3" axles or part # K71-384-00 for 2-3/8" axles. The amount of height you gain will be equal to the diameter of the axle plus the height of the leaf spring seat and stack. Basically, the over under kit raises the trailer's frame and since the coupler is attached to the frame, it is going to raise that as well.
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