On my previous drag week in 2018, I readjusted the coil springs on the rear coilovers twice per day to support the load in the trunk, and then again to go back to race setting. That and the clutch adjustment were the two most time consuming, pain in the hind end chores in the switch over and I decided I was definitely going to get rid of both processes. Originally, I bought an airbag that I was going to mount right on top of the center of the differential and fill it up for the street drive. But then I heard about these spring rubbers that you can just slip in between the coils of the spring and it supports more weight. So I bought those and it was very quick and easy to do and involved no installation.