The trigger feeder is rather complicated.I LIKE your feeder, but it looks complicated. Wondering if I could connect it to a larger container. I plan on checking on the birds at least once a day, probably in the evening, but sometimes we may be gone for a school activity, and I'd like to make sure they don't run out. Or maybe two containers would be better - allow more feeding room.
As for wheelbarrow...the door will be about three feet above the ground, so we'll have several steps to go up or down. Thinking might make some sort of "funnel" to rake stuff out the door and into a wheelbarrow when the time comes, although I've heard several say they just rake the bedding into the run and the birds spread it out.
But thought they were cool and wanted to play with the concept (equipment designer by trade and tinkerer/builder by nature...so....)
The water bottle version at bottom of page is what I'm using now, much simpler to build.
I built a prototype for my brother, he had amazon deliver the bottle, and drew plans for him to build one for his friend.
I ended up using it long term when I got some crumble that wouldn't feed thru the trigger orifice.
I have a couple steps up to my coop shed(see My Coop) just have a piece of plywood I lay down over steps as a ramp to bring feed bags up on a hand truck.
But yeah, wouldn't attempt rolling the wheel barrow up it.