looking to see how people have addressed this issue.

I carry anywhere from 300 - 1000 pounds of product in the wagon at a time.
The back seats are in the down position to give me more room.

Over the past 5 years I have had to address the rear of the vehicle with the following:

replaced the rear shocks twice now. looking at a 3rd time.
replaced the rear coil springs once now. looking at going heavy duty.
replace the volvo swaybar with an IPDUSA Swaybar last fall.
replaced the swaybar links every year so far.

Currently with everything out of the car upon visual inspection.
front/rear driver side is lower by 1 inch versus the passenger side of the vehicle.
Also it is looking like the rear is sagging once again.

looking to see if I can do nivomats on the rear (self leveling) or should I look at something different.

Let me know. Thanks.