Mercedes s500 trimbles and shakes while driving at 65 mph but stops at 80 and above what is the problem?

Mercedes s 500 shakes and bounces at 65mph but stops at 80mph please help

Basic checks first - are all the tires pressures set right. Are all the tires in comparable condition?. Is there any evidence that one of the tires has lost a weight. - that is most likely your problem. Also, have you made any emergency stops and worn a flat spot on one of the tires. When it is on the lift to check the tires - have your mechanic check for any loose or worn suspension items - just in case.