I guess I just don't get it.
If a chicken tractor is secure enough to keep your chickens safe while you're there it should do the same when you're not. If a feeder/waterer stays full for a week while you're there it should stay full if you're not. I mean, your presence will delay some things, it allows you to react to some things, but it will prevent nothing. Ultimately the only thing standing between chickens and their predators is the walls you put around them. Ya'll see unnecessary loss of life when there's injury or disease you can't take the time and care to treat. I see chicken dinners and replacement chicks.
Maybe it's just me, but most days I do two things; feed/water my flock and open/close the door. I can't leave food out but my pen is not designed to be rodent/small bird proof. If it were I'd have an auto feeder. And if they weren't expensive I'd have an auto door. If your waterer/feeder/coop/pen fail occasionally when you're at home they're not good enough for this... So I wonder if people see the things that went wrong with their own equipment and dismiss this possibility. But solid well-researched and built equipment could make this very feasible. Especially in certain areas of the country.
I mean, lotsa people even leave for vacation for a weekend or even a week sometimes and leave their chickens or even cats with auto feeders and such.
It makes me especially sad that some of the posts have been so aggressive to the OP and their idea. Frankly, the hostility is not warranted. :/ That sort of thing turns people away from chicken keeping in general.
I'd ask the OP to keep us updated but it wouldn't surprise me if they didn't want to so... Whatever you choose, good luck.
. Anyway, if you did move forward with your plans I am interested to find out how you built a coop, more specifically what auto door you used and how is it working for you? One of the reasons I am not supportive of your idea is the dependence on technology in your absence and the likelihood of tech failure, i.e., the auto door not opening/closing. I had a very negative experience with my auto door. I spent $500 on what I thought was the best auto door on the market - it had wi-fi, a predator alert, a solidly built, thick wood door with a motor that opened/closed the door, and an electronic key pad to program the door. To make a long story short, I should have just took the $500 and set it on fire instead of wasting it on such a faulty product. I had many, many problems with the door not opening up in the morning. I thank my lucky stars that I was at home to manually open the door each time it failed. I finally had my hubby remove the whole darn thing so now it is up to me to open/close their coop every day. I would love to get another auto door, especially since winter is coming. Did you have a successful outcome with your coop/auto door? 
