My brother and I are going to start making some money using my Duramax hauling cars. We will be using a 3 car trailer that weighs 5800-lbs and is rated for 14,000-lbs. I am concerned about the stress that I will be putting on the suspension and just the entire backend of my truck. I drive a 2006 GMC Sierra 2500HD 6.6L Duramax. If anyone had any comments, questions, or concerns, plz give me your input because I definitely need it.