2007-2008 GM Large SUV Hitch question?

Anyone towing with a new body style GM Large SUV (Chevy Tahoe, Suburban, Avalanche, GMC Yukon, Yukon XL,  Cadillac Escalade) 2007 or 2008? I have a 2001 Chevy Tahoe, this is only about the "new" Body style. It has to do with the hitch. I am looking at a 2007 Chevy Avalanche and the hitch is really high. When my Tahoe sits next to it, The Avalanch sits only about an inch higher, but the hitch on the Avalanche has to be 7-8 inches higher. It sits in the rear bumper, where the older Tahoe sits under the hitch. I already use a 2 inch drop. Anybody that tow with one of these trucks, what size of drop do you use on your hitch? The guy across the street has a 2007 Yukon and he tows a camper trailer with it and he used an 6 inch drop, but the camper sits high to begin with. And when he tows his quad trailer it drags the rear of it when hitting dips.  My boat trailers sit low, and I like my trailer to sit level.