I have a 2015 Silverado 2500HD LTZ Z71 4X4. It came equipped with the (RPO Code) i06 infotainment system. So what is the difference with the 1500 vs the 2500 i06? Is it the software or radio components? I want projection and text to talk. Chevrolet states that it wasn't available on the HD vehicles. What do I need to do to change this?