I recently picked up a 23 foot expandable trailer to take my family to Florida this winter. The cost savings alone with a camp site vs. a hotel will pay for the trailer and fuel since we are going to end up in the Florida Keys. I have a 16' flat bed trailer that doesn't have this issue, so I am pretty sire it isn't the truck itself but something in the trailer. The system keeps connecting and then disconnecting the trailer while driving. Says "Trailer disconnected" and a short time later "Trailer Connected". When "Disconnected", the lights and brakes work as normal. The camping trailer has 6 of the wires used (Ground, Aux, Brake, running, left, right) while the flatbed is only 5 (Brake, ground, left, right, running). I replaced the plug on the trailer since the old plug was in pretty bad shape and was doing the same thing as the new plug is. How does the system know if a trailer is or is not connected?