I know several people who have installed leveling kits on several types of vehicles, and ALL of them have had problems.
Either lift it the right way. (SAS is cool) or leave it stock. If you gonna tow, leave it stock.
I have a young friend that cannot seem to help himself and always lifts things then wonders why they don't tow for crap afterward.....
05 2500HD CC LB LLY, 4x4, 3.73s 235/85R16's, webasto cab heater, to keep it warm.
03 Buick Rendezvous - When you average over 80 miles per day driving around, you need one of these.
85 K-5, 6.2, SM465, Rockwell T221, 1 tons, 36's. More goodies to be installed as time and money allows.
82 K20, 6.2, SM465, NP208, stock except for bed rack, snow plow, and glow plugs are on a toggle switch. It works great for plowing!
72 Postal Jeep - Yet another project