With the Roadster's 0-60 capability they do well with extra weight on the driven wheels. If they had AWD then make the weight even, but since they are rear wheel drive it helps maintain traction to have more weight in the back. (At least from doing quick 0-60 runs without slipping the tires. From a slalom handling standpoint it would be better to have more even weight distribution). And back to Mini-E - worst case is to have weight dominance on the non driven wheels.