I guess it depends on how long you're going. I've gone a week, no attention to the tank. Two weeks and I had a friend stop in to change the top off jugs,and feed a bit. When I went for 6 weeks, I had sold my tank before going. Big range
For my next trip of a week, I'm fine leaving as I have ATO plumbed in and everything else is on a controller. I can check from the beach if I want to, but I'll probably be preoccupied.