What's the consensus here on the various trim packages for the GMC Yukon? In my understanding most trim packages are just moneymakers for auto manufacturers. My wife likes the Denali, but we have an SLT. I keep telling her to get the Denali wheels and she'll basically have a Denali. What are the major differences between the Denali and the SLT (2014)? Are they performance differences? And is it true with the Yukon that trim packages are basically big moneymakers for GMC?