GMC Sierra AT4 vs Elevation vs SLT: Which Trim Actually Makes Sense for Overlanding? The Sierra trim lineup looks simple until you start pricing things out. AT4, Elevation, SLT — they’re all Sierra 1500s. Same cab options, same bed sizes, same engine choices. But they’re built for very different people, and picking the wrong one for an overlanding build can cost you real money or leave you bolting on workarounds to a truck that wasn’t designed for what you’re doing. I dri