We just bought our 2009 BC 3500 home yesterday. Storms in CA might have caused rain to come in the front door. The rain was coming down sideways at times. We had a small square piece of carpet that was left by the front door by the dealership. After the storm passed we decided to open the door and check, sure enough the carpet square was soaked. Is there ANY reason why the rain would come inside the 3500? We checked all walls, ceiling openings, carpet and slides....no water. Only large amount of water by the front door. Please help!