My friend has a 2007 E350 sedan 4matic and she keeps blowing out tires. She is running 17" tires with a very low profile. The dealer keeps telling her that she has to run this low profile tire and that there is no other option for a beefier tire. I think the dealer is just selling her a line as she has bought 7 new tires in the last two years. Does anyone have a recommendation for a tire with more profile?