The vehicle design goes down to what tires you pick for it. If you pick a tire with a higher failure rate that is more sensetive to things a car sees often, then your design choices were poor and you are at fault. As an automaker it is your responsiility to make damn sure all your suppliers supply you with good parts. If you don't then the overall design of the vehicle may be compromised. That is your issue and your issue alone. It is especially your issue when you knew before releasing the vehicle to the public that the car's handling was so adversly effected by tire pressures and that the low tire pressure you recommended would need a tire that could resist failure due to heat buildup more than you would need on other vehicles. Ford could have corrected the tire pressure issue by lowering the center of gravity of the car, fitting it the an IRS or any number of other things. Instead they chose to fix the problems by adjusting tire pressures downward. This was an accident waiting to happen because as soon as you lower pressure in a tire to a abnormally low level you are asking for eventual failure. If you knew that failure would case the car to be almost impossible to keep on the road because of its high center of gravity, then it was your responsibility to not only not recommend the lower tire pressure, but to make the handling safer by adding the IRS and lowering the center of gravity of the car.
