[MarkEHansen]

I really don't get the "you should not fill the tank" responses. If you're going dry camping, you need the fresh water. Why on Earth would a manufacturer install a water tank which cannot be used?

I think if the tank can't support a full load of water while towing, the manufacturer should clearly state that in the owner's manual. Otherwise, we should expect it to perform. If it does not, it should be a warranty claim.