Hey guys, I'm in the market for a an 02-04ish tahoe or yukon. Before I make a purchase I need a little advice on what to look for. I have about $15,000 to spend, it needs to have 4wd and I need to tow a boat that weighs ~ 4,500lbs(including trailer). The car might also be used in a livery fleet, for a limousine service. I've read about the Dexcool head gasket problems, is this really as widespread as people make it out to be? What should I look for? Is a towing kit with transmissin cooler really necessary? Is flex fuel worth it? I live in Colorado, and there are E85 stations all over. When I'm looking at tahoes or yukons what other advice can you give me on what to look for? What options are a waste of money and which are worth paying for. Thanks!