i have a 99 3500 bought new and the outside mirrors [heated electric standard] vibrated so badly i could not identify what brand of car was following me or even if it was a cop car... . at about 3500 miles i finally talked the dealer into replacing the left one as it was about to fall out of the housing... . but still baaad!!!! then i had bug shields put on... still bad vibration on mirrors... fianlly went back to dealer and complained mightily... . service rep stated DC has a service bulletin out that "bug shields CAUSE the mirror vibration"... . sound fishy to you???? i have given up being able to tell if it is a car or a truck behind me... . [maybe a little exageration]..... but is a real nuisance... plus any canned drink in the cup dash cup holder vibrates enuff to spill out in a major way... had to go to bottles. any ideas about the morrors????? thanks.