Unfortunately not because the springs must be ground flat top and bottom to work with the adjustable rear setup.
Like Ryan said best bet is to sell them and buy the kit by itself
Rear Height Adjuster [10+ 4-Runner] – Peak Suspension
The lift springs will tear the shocks apart literally. They can't handle the added force at full droop. That and often they don't have enough valving to control the springs if any higher than OEM rate.
Common issue, Eibach just introduced a rear coilover conversion solution with selectable rate and height. Perfect for dialing ride height with the rear loaded down.
Rear Height Adjuster [10+ 4-Runner] – Peak Suspension
If you're looking for an adjustable custom drop in solution, Eibach just released an adjustable rear coilover conversion. You can pick spring rate based on your weight and dial in your height.
Rear Height Adjuster [10+ 4-Runner] – Peak Suspension
Having the back loaded down can definitely lower the height. They also have a rear coilover conversion now that allows you to pick the spring rate and dial in the ride height depending on load.
Eibach Pro-Truck Kit with Rear Height Adjuster [10+ 4-Runner] – Peak Suspension
Yes Eibach is releasing a 2.0" coilover this summer. They also just released a rear adjustable height system which allows you to pick the spring rate for the weight you have and dial in the ride height.
Rear Height Adjuster [10+ 4-Runner] – Peak Suspension
Bilstein and OME both make quality products. Eibach also just introduced a rear adjustable coilover conversion that might help you dial in the rear ride height with the added weight that you have.
Rear Height Adjuster [10+ 4-Runner] – Peak Suspension