Hi guys. I am going to start towing my grandsons car to the race tracks this summer, and I was looking at getting an Air Lift helper air bag kit for my 2000 Sierra 4x4 with a Bell Tech 2/4 drop. Does anybody have part numbers for kits that will fit my application? Is anyone towing with a lowered 4x4 on helper bags using Air Lift or any other brand? Any help will be appreciated. Thanks.