dude, I wouldn't bother with a tie-strap rack (and I don't even have $20k in bikes, just maybe $20 in bikes).
Your experience may vary, but here's another discussion, I put pics of my (bolted on) rear bike carrier.
http://elcova.com/groupee/forums/a/t...1/r/7531077741
H3 Guy said a buddy of his had the rear hatch buckle from the extra weight, but I'm now looking at a month of 1-2 times per week bike carrying (10 miles one way) and no buckling. I'm keeping a close eye on it, but I think a rear tire carrier is cool, plus a rear hitch carrier may not work w/o an extension.