It's a 6x5 foot trailer that will house 6 hens for next spring. I plan on 4 foot walls and a 4/12 pitch roof. The trailers axle is close to the ground so I plan on the run being strictly off the back of the coop, 12x5 foot. I'll be able to move it daily 8 months out of the year but December through March we'll have 3 feet of snow on the ground (or more). This will be my winter project.