Is the truck garaged?? You have to remember that using a car wash is like having your car in a class 5 hurricane....

Make sure your drains are clear in your Moon roof, particularly if your truck is not garaged.. Should be able to find the drain tubes in the corners when sunroof is open.. Turn DOWN the pressure of your compressor and blow out the lines... Be my first task....

When and if you try to find a leak with a garden hose, 2 people, one inside one outside with hose..NO pressure, just let in run out of the hose.. Start at the BOTTOM of the cab area and work up, then up to doors, bottom of windows, cowl area, then tops of glass, then finally to the top of roof.. don't be in a rush....