I am seriously considering buying a used Buick Enclave in the 2009 to 2011 vintage probably but am hesitant to do so because of numerous reports of steering rack failures on these vehicles. Is this a serious enough problem to not buy the car? Is there any way to check for impending failure or any maintenance that can be done to lessen the chances of failure? Are there certain model years where the problem is worse or better? Thanks in advance for any and all help with this.