Caulk the outside stove vent. The rain comes down over the awning down the sidewall right on the vent. The vent outside is not caulked. How do I know?? It happened to ours. I clear caulked it top and sides of that vent and have not had a problem since. So much water come from the air conditioner area and overwhelms the rain gutter . Also check your gutter, mine is long. They butted two prices of gutter together and it had a hairline crack and let water streak down the side. I caulked that sucker too!!! Hope this helped..
2014 Forest River