So I have a set of 9 wrap LC coils in the back of the runner and they handle great offroad when there's not much in the trunk. But when i take it camping, the rear sags about 3 inches with all my gear so I want to install helper springs to counter that. So I know the Firestone 4135 kit is recommended for a stock 4runner. But does anyone know if it will work with the 4.5 inches of lift the 9 wraps provide? If not, which kit should I get instead?