AMG wagons have always occupied a strange but wonderful corner in the performance-car world. They were never the obvious choice, but for those who understood them, they represented the perfect blend of insanity and practicality. Cars like the old Mercedes-AMG E 63 S Wagon gave us V8 thunder, ridiculous speed, and enough cargo room for a family road trip. The new E53 Hybrid Wagon does not abandon that idea; it rewrites it for a different era.