A mobile inspection can be surprisingly thorough these days, especially if the company brings proper diagnostic equipment and has experience with trucks. They can usually check for leaks, scan error codes, inspect suspension components, and look for signs of frame damage or corrosion. The only limitation is that some areas may not be as easy to access as they would be on a full workshop lift. If the inspector provides detailed photos and a written report, that can add a lot of confidence. For a vehicle of that age, I would also ask them to pay close attention to driveline components and vibration-related issues. I once looked at a truck that seemed fine during a short test drive but later needed a Quality Vibration Dampener Fix in Shahama because a hidden issue had been overlooked. A good mobile inspection is definitely better than no inspection at all, especially if the seller is not willing to visit a garage.