Perhaps a little clarification by me is in order. The coop is actually square and is above grade level by 4 feet. It has 4 legs that are California tri-cornered with 2x6 at a 90 degree angle to a 2x8 running lengthwise. 10 inch lag bolts and 3/8 inch carriage bolts affix each leg to the subframe of the coop - which is a sheet of marine ply and a labyrinth of supports to keep a 2 inch space for insulation in the floor. Where the legs meet the ground, I have a pair of runners on two sides - these are laminated from 2 2x8s, with a turned-up nose for forward motion. I pull the coop with my Suzuki Quad-Runner in LOW Range. It works. Any wood in contact with the ground is treated with a 24-hour dip into some creosote that I have that the State of California never knew about nor seized from me as a Class I Carcinogen. To dip long boards, I just used ABS pieces of gutters with end caps. That way I can keep the ends IN the chemical and make sure it is absorbed. I love the smell of creosote - brings back memories! I digress. The caged 'playpen' for the chickens is on it's own runners that are doubled-up 2x3 hardwood from a pallet, and there is a towing chain on it if I have to move it separated from the coop - like when I have to make a sharp turn in the back yard.... otherwise, the playpen follows the coop as I tow them both to new grassy areas. I estimate that the coop weight is somewhat over 300 lbs by itself with all the triple-walls and support beams in it - plus OSB isn't very light either! I used over 9 lbs of screws, a few lbs of 'other' hardware and bolts, lags n' such. Even the cantilevered roof is over 40 lbs. I built this coop extra-heavy - for which I have been derided by a good friend. But he raises his chickens in converted refrigerators - so he can't really talk about this weight to me! So-o-o ---> blowing over in the wind isn't in it's future at all as I see it - and we don't get killer 60 MPH winds on this side of The Continental Divide anyway. Winds of any ferocity are an Eastern Montana product.