I'm working with a dealer to spec out a truck. We'd been oriented on a Big Horn. When I asked about getting polished AL wheels instead of chromed AL wheels, they said that can do that on an SLT. I've spend enough time building versions of the various trims at RamTrucks.com that I pretty much have it memorized. There is no SLT listed for the 1500 only the 2500. So what is a 1500 SLT? How does it differ from a Big Horn?