I just drive one front tire of my stock height Z up onto a section of 2x12, and that is enough where I can get my low profile 3 ton jack to the front center jack point. The first couple of pumps are tight and will hit the chin spoiler if not careful, but it's the easiest method I've found.
**edit** This is the exact jack I have
http://www.northerntool.com/shop/too...FQ6MaQod9EQAAw I think I may have said in another thread that I use a 23" high lift jack, but that was a different jack that belonged to someone else.