I drove OTR (OVER THE ROAD) for a few years. PST shipping, 53ft long trailers with a freightliner rig. A pro truck driver has to do a pre-trip inspection every single time after every single stop. stop for fuel, inspect before you go, stop to sleep - inspect before you go, etc etc.
just like your car breaks don't suddenly "go out", there are warning signs. his fault and the company... period.