Jim, ours is also a 2007 Dodge 3500 4x4 with stock suspension and stock 17 inch wheels. When I had the Reese hitch on a manual slider the ride height was fine. About 7 inches of clearance over the rear corners of the bedrails. The slider under the hitch raised the saddle a bit.
When I went to the superglide, the saddle sits lower than the Reese on a slider. To compensate, we dropped the pinbox one hole in its mount. We again have a little over 7 inches clearance.
I don't know your situation but hopefully there is some room for adjustment on your rig.
I don't know what a drop insert is.
Or did I misunderstand your question and your rig runs nose high? Ours is slighly nose high but you have to look hard to see it. Or get out the tape measure.
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