I just bought a '79 33ft. avion that leaks. We sealed the roof, put new vent covers on and cauked all seams. It still leaks down the front and back walls. I believe it's coming in around the windows. What's the best way to fix this. Does anyone know someone in or near Ga. that works on older trailers? I have two Avions and would like to find someone to trust when I need help. Thanks,ja