Paragon is right on, the amount of drop required is dependent on three factors:
1)Level height of the loaded trailer tonque to the ground
2)Tongue weight of the loaded trailer
3)Loaded height of the vehicle's platform hitch receiver, assuming you have the factory frame mounted hitch.
Towing a trailer safely should be a priority, not an afterthought. Have a professional assist you if you are unsure about anything. The Hummer you save may be mine. 
Dave
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1999 AMGeneral H1 6.5TD BLACK Wagon e-Lockers Front and Back, Rubberduck4x4 RockTubes, Extended Undercarriage Protection,"Big Duck" 2" body lift/2 1/2" suspension lift, 41" IROK Radials on 17" Cepeks w/Rock Rims, (in process)Centered front diff, 3.08 gears, 12k Brakes and 12k halfshafts
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