The car rack straps to the back of most cars using 6 straps. Very sturdy and can carry up to 3 bikes. Details including fitting list can be found here:
http://www.thule.com.au/images/product_ ... rap-On.pdf
Price brand new is $179 and willing to sell for $100 ono. Only used a handful of times so in very good condition. Pick-up is from Seaforth, Sydney.