I have made a few decisions for the rear suspension on my GN. I plan on using the boxed UMI uppers (possibly adjustables) and lowers with the Full Throttle sway bar. I have a brand new (never out of box) set of dual air bags. Are they useful with the other items, or just overkill? I really don't want to have to use them if they will not help much. If the air bags are not needed, they will be up for sale for a good price.