I have a '99 Ford Ranger that only acts up with the trailer on it. When you open the drivers side door you hear the usual dinging for warn you that the door is open. The problem is when you close the door the dinging doesnt stop for 10 to 20 seconds. Also when you drive down the raod sometimes the light will come on that says that the door is open and it will start dinging then and the overhead light comes on. I have had this truck for over a year and it only does it when the trailer is on. Its not a huge problem but really annoying after awile.