OK, even as I type my wagon is out in the driveway on the jack with the right rear wheel off. I positioned my floor jack right under the rear shock, where it pushes up on that whole arm assy.(don't know it's proper name) It doesn't touch the shock bottom though. I must admit, I never thought about putting something under the jack or jack stands to keep it from scratching the metal. I always worry about adding something extra that could slip.
JL

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John