I have 33X12.5OR17 tires and my tire pressure light just came on. Apparently they were inflated to 55psi by the company that installed them and the light wasnt on. I towed my boat today and mysteriously the tire pressure gauge came on. I called my dealership and they said to air down to 45PSI and drive 5 miles. I did that and it is still on. Any advice as to what PSI I should run? Stock I think was 33PSI but that seems too little for this size tire.