Don’t tell General Motors (NYSE: GM) that sales are plateauing and this is as good as it gets, because its first quarter just annihilated Wall Street expectations. With consumers increasingly opting for larger and much more profitable SUVs and trucks instead of passenger cars, the stage was set for a boom in profits. But is there more at play here? Let’s take a look at some highlights from GM’s strong first quarter and discuss a couple of takeaways from its massive earnings beat.