Rain Water in Black Water Tank???

I'm so glad I found this forum. I don't know why I didn't think of it sooner. I'm a member of 2 Nissan forums since I drive a Nissan, I'm a member of Glock forums because that's what I shoot. Now I own a camper so....here I am! I appreciate all the suggestions and knowledge. To give you all a little background I had been looking for something to take to my hunt club and park so I would have a roof over my head. I really didn't expect to find a camper as nice as the one I did for $500 but now I see there may have been a reason. I thought about just gutting the bathroom and making it a storage area but the camper is (was) in such great shape I wanted to keep it nice in case I decided to take it elsewhere, like to OBX during the Summer. Now that I've got into it a little bit the storage area idea is sounding better and better but I'm trying not to get discouraged. Thanks again and I'll post this evening when I have some more info.