Is there a drain for my fresh water tank. I have the coach parked at a friends house, and it is getting down to about 28-30 degrees at night. Since I can't plug it in right now, I am concerned that something might freeze. I though I might try to drain the fresh water if I can, but so far, I have not found a way to do that unless I pump it all out with the 12V pump. On one page of one of the manuals, it says drain the fresh water tank, but they don't elaborate on how to do it.