 Within a month of the purchase date, we had the van back into the dealer with a shaking problem when braking from extended driving periods.  It was taken to the same dealer 4 times before it was finally diagnosed.  It was not a safe feeling to be on an extended trip and wonder if you were going to make it home or not.  Within a month of the last service visit, the driver sliding door began to rattle and squeak when driving over any type of bumps in the road.  Then water began dripping through the sunglasses holder just above the rearview mirror.  This was caused by improper sealing of the front windshield and they are having to replace the entire windshield.  Bottom line...DON'T BUY A QUEST!