It's also important to support the car as noted above during extended storage (under the A-frames and rear axle) to keep the suspension as close as possible to normal ride height; if the suspension is allowed to hang at full rebound for long periods, it will prematurely deteriorate the front upper and lower control arm bushings due to the extreme torsional stress on the rubber elements in that position. Also true, but to a much lesser extent, on the rear spring front eye bushings.
That's why the assembly manual says to torque the control arm bushing through-bolts with the suspension at design ride height, so there's zero torsional stress on the bushing rubber elements with the car on wheels.
