Thank you for your input! It's appreciated!
To be honest, when we assembled the run, the last thing we thought about was our future snow loads. After discussing with my husband yesterday, I got that blank look, oh crap face. Details matter, and that is one we overlooked. Hard to think about snow when it's sunny and 80 degrees.
We have decided to add additional wood framing around the metal run to help support for the snow. The main coop is reinforced with 2x4 throughout and enough support under the roof that the snow loads are not a concern. It know it looks kinda janky from the outside, but I promise its solid, and it took 5 grown men to move it.
We decided to do a 4" layer of wood chips on top of our 6" layer of soil. We will see how the girls handle it and adjust as necessary.
We do have predators in abundance and we have neighbors who lose their flocks regularly. We opt'd to fully enclose to be safe, rather than sorry. Overkill? Maybe, but it makes us feel better.