as its not a million miles away, 50 or so if i remember right? have you considered employing someone to run the round for you? you could pop back and monitor it a couple of times a week if necessary, that way it's still yours, and judging by previous posts, its earning you enough to afford to employ someone to do it...
just a thought.
of course you would have expenses, such as sorting out water for employee, 2nd van, etc, but, could be workable?