Frame Rust problems of the 2007 Ford F-150

I have a 2007 f150 with 96,460 miles. Drives on PA roads never off road and no hauling. Driver side frame rail is rusted at a point immediately behind the forward mounting bracket of the rear leaf spring. The amount of rust is extensive. The inner wall of the rail is rusted through creating a hole approx. 10 inches long and ranging from the height of the rail tapering rearward to about 3/4 of an inch. The bottom of the frame rail is also rusted through at a point where it meets the spring's mounting bracket. Although the metal appears somewhat intact there is no structural integrity. This leaves only the upper portion and outside wall of the frame rail intact but also rusted. Based on my observation this truck cannot be driven safely. I am not aware of any solution other than to replace the frame but this will be determined by a professional in the near future. As to the cause I do not know. This damage was first noted today 8/14/2019 and was not detected during an inspection in 12/2018.

Tl - the contact owns a 2007 Ford F-150. The contact stated that the vehicle frame had rusted. The vehicle was taken to an unknown dealer who diagnosed the vehicle and stated that the frame was fractured, but the vehicle was not repaired. The manufacturer was notified and referred to NHTSA. The failure mileage was 119,000. Jc.

Frame is completely rusted through to the point that it cannot be repaired and is unsafe. It cannot pass a state safety inspection and has deteriorated to the point where it cannot even be put on a lift because it has no structural integrity. There are large holes rusted through and where it hasn't entirely rusted through, the metal has deteriorated to being less than half of its original thickness. The problem went unnoticed because the rest of the truck showed no signs of any advanced deterioration.