Purchased hummer 1yr ago at carmax. Excellent service but my problem is with Maxcare extended warranty they sell. Purchased the best they had. GM dealer had to go back and fourth with them to fix the issue. Then they send someone from Maxcare to inspect  vehicle issues which is another two days. Inspector denied covered item and I was only told axel was not leaking and it was only seapage and 4x4 switch issue denied as well. GM didn't understand why I was denied.  Few days later I get notice that they will not cover my h2 hummer any more because I put on different set of wheels on it or at least cover anything that they believe issues relates due to wheels. There the same size rim and tire as stock.  That's the real reason they denied those items. The sale person told me I can modify hummer and Maxcare would still cover and was giving nothing saying that I would not be covered if hummer modified. Immediately canceled Maxcare.  Maxcare was a big part of the reason why I would send friends to Carmax. Not anymore, sorry carmax.