The drop is measured from top of the hitch to top of where the ball mounts. So, if the ball mount was flat with the bottom of the tube, it would be a 2" drop. I have an 04 2500hd, no lift, 32" tires. I use a 4" drop for my boat. You may need a 12" with the bigger tires. I believe my hitch (top of where the ball mounts) is between 16 and 18 inches off the ground. Boat trailers are a pain anyways with scraping.
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