While in cruise control @ 75 mph I feel the vibration almost like a short section of bumpy road , how ever it builds until the tire light and check eng. light comes on . If i do nothing and leave it on cruise @ 75 mph it will continue to increase the sensation aprox. 1/4 mile , but then go all smooth and the lights go out and away. When i get to work we plug into it with a scanner and get no codes except for (Low ABS signal) Is this familiar to anyone ? Also when it has started to happen once previously i have sped up like you would an out of balance tire ,Exe: going 74 mph and when the feeling like a rear tire out of balance starts the shake/rumble and the lights go on on the dash, I gradually increase to 78-80 mph and it goes away quicker .and the lights go out too. ( ??? )