"I once heard a tale from a supposed engineer at Jaguar in England.  When they were at the final stages of testing the XJ (circa 2006), they realised that when travelling at high speed on American concrete roads, the joints in the road surface were causing the car to lose control due to uneven weight distribution. After frantic last minute meetings trying to find a solution to the problem, they determined that they were too far along in the design process and the only viable option was to place 2 huge weights in the trunk at each side of the car.  Not great for fuel consumption, but at least you kept your life."