Water getting into air filter

[iambat21]

We have a 2014 RED that is getting rain water in the air filter canister. Once it was so bad it turned the paper of the filter into paper mache. The rain water is coming in thru the 7 open louvers on the top rear drivers side. When you examine it seems there should be no way water can get to air filter. But it is in our case. Partial remedy so far is to drill 2 small weep holes on intake hose before it gets to air filter. Even after doing this a small amount of rain water is still getting to paper. Spoke to Tiffin customer service and they have never heard of such a thing. Curious if other owners have experienced same. This is pretty important stuff because if water or damaged filter paper gets to engine it is a tremendous negative game changer. Please advise if encountered same