Heard a Boom

So after some additional research I don't think I blew a tank. I feel kind of stupid actually. It was incredibly windy last Saturday here in the great State of Wind (aka Kansas). I'm just standing outside the camper later in the evening doing nothing in particular and I hear this big bang and look up to see the basement storage door swinging free where it had been in the open latched position a few seconds before. I thought hmmmm....now that sound seemed awfully familiar. On Sunday after my daughter woke up I did a test. I asked her to set in the camper where she was the day before and tell if the bang she's going to here sounded anything like the bang she heard the day before. I opened the basement door all the way up and slammed it shut. Guess what? She said it sounded exactly like the bang we heard on Saturday. I thought well we'll see how the tanks drain when I go to the dump station........at the dump stations the bathroom gray water tank drain perfectly. Only explanation I have. The only other test I plan to do is to fill the gray tank completely up with water to to the bottom of the shower drain to see if the tank has any cracks in it.