Yes, it sucks when the headliner, carpet, and seats get soaked and possibly stained. But the bigger thing to worry about is the electronics mounted to the back wall of the cab, unprotected from water. Specifically the RF hub. When that goes it's more than an inconvenience, eyesore, or unpleasant odor. It makes the truck basically a giant brick. Completely unusable. And not to mention, at least in my case, the three month wait for the new RF hub to come in. You might want to consider using a car cover until they're able to get the rear window replaced if you're expecting that much rain. Sure, it's inconvenient. But at least you'll still get to use the truck. Just a little advice from someone who has gone through that.