mpanten Yes for jacking the car off the ground. This also keep some of the moisture away from the car buy having air flow under it. DON'T hang the suspension. Put the jacks under the front and rear end lower control arms or outter splinders. I have seen shocks loose there seals from being hung with the pressure of the springs and the weight of the tires and rims.
Watch what rags or paper you use to protect the frame. Some will stick like glue.
It also casued a small rust spot on my frame after winter storage.
Rick L.