I recently purchased my first cadillac, a 2000 DTS. I am aware that the DTS has a slightly stiffer ride than the standard deville but I always imagined a cadillac riding like a magic carpet.I thought cadillacs in general would have a smoother ride than mine does. I am looking for the quietest, softest ride possible. The car has 76,000 miles on it. Would a new pair of factory shocks give the softest ride or would an aftermarket brand? When do shocks typically need to be replaced? Who makes the best tires for the quietest, softest ride? I was also thinking of getting a spray on undercoating to further quiet the interior. Any suggestions would be appreciated!