HWH fluid is everywhere--how much can we lose?

thanks guys for the heads up on having the slides in and jacks up--also something I wouldn't have considered, tho possible something DH would have. no, I'm sure he wouldn't have added more fluid prior to leaving. come time for pre-flight, I'm usually it, and a nag about tires that appear low. we were trying to hit the road--not wholly his fault.