Hey guys, I'm thinking of adding either air bags or overload springs/ add a leaf kit to my 04 2500. I just want the extra support for when I tow so the truck doesn't squat too bad. Any opinions as to which might be better? Any brands of air bags better than others? any brands of add-a-leaf better than others or are factory 3500 overloads as good or better? thanks for any insight, suggestions and help.