hf1

Springs and shocks would be sitting frozen in an unnatural extended position for too long. Probably nothing would be "damaged" but they were not designed for that steady-state position and will be changed/affected. Risk not worth taking to prevent tire flat-spots that will go away after you first warm them up in the Spring, which is much easier to minimize by just over-inflating the tires during storage. Talk to a any collector with a barn-full of cars -- ask him why his cars aren't sitting jacked up in the air. YMMV.

Gadgetman

QuickJack at Home Depot for $998!
BL-5000SLX 5,000 lbs. Capacity Portable Car Lift for $998!

0-Day

I bought these when it was about $50 more at Home Depot a few days ago, and I thought THAT was an unbelievable deal. These are great, and this deal is even more insane. The free shipping to home is what makes this such an incredible deal. This kit weighs about 200 lbs total (shipped in 3 huge boxes) and they are somehow shipping it to you for no charge!

(I have no affiliation with or financial interest in HD. I just love deals.)

BTW, I am storing the 2 jack units flat on the floor of my garage, and I park my GT4 on top of them with no issues. Nothing touches pulling in or out of the garage over them.