Raise the back slightly and give it a bit of a stance rather than just dragging bits on the floor and having to drive everywhere at 20mph.
Lowered is great but once you ruin the car's main function you may as well walk.
As for getting a jack under it - I drive mine onto a block of 2x4 wood to make enough space for the jack

I decided that I couldn't go much lower than this without sacrificing function - that being loading two big dogs in the back, occasionally towing a trailer and driving on some of the worst roads in the country (Thanks East Sussex Highways!)
