I'm planning a similar setup with my mini-station wagon (Toyota Matrix). I have the tarp, guylines, and stakes, but what do you use for poles? Because of the small car, I need something that telescopes or folds up to about 3 feet and extends to between 6 and 7 feet. I don't want to spend a lot of money! The cheap poles (not so cheap at $40/pair) are far too long when telescoped, and the ones that do fold up (like the Kelty Noah's Tarp poles) are hideously expensive (about $50 apiece).
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey