That too is also a good idea. The tires, I always forget something hehe.
Yes Level ground. I have a nice flat driveway, and Tires under always.
And as I said I also always keep the floor jack raised as well taking a slight load, as extra protection.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.