My driveway is ridiculously steep, but I don't scrape by boxster provided that I approach at an angle as folks have already recommended. depending on how obssesive you are, you might take a look at these (or something similar):
http://www.griotsgarage.com/product/in+your+garage/garage+flooring/curb+bridge.do?search=basic&keyword=curb&sortby=newArrivals&page=1
:dance: