We have a thule rack, where the fork locks into a front skewer and the back wheel sits in a tray. Both our bikes were locked, as well as our friends bikes on their car (same time of rack). we had gone into a restaurant for dinner.

WE came out and our friends bikes were stolen (over 10000$ in bike ouch!) and my husband noticed two guys with his bike, he yelled, they dropped the bike and ran. They had used something to weaken the metal and plastic and took the whole bike and the tray right off the roof rack! they had obviously tried with mine, parts of the rack was cracked, but the thieves had better luck with my husbands bike. we came out in time to save our bikes.