I'll be putting in some rope support based on your suggestion as I can surely imagine that will happen. We had big south winds today, gusting to mid 30's. The front and rear legs were rotating (they are L shaped on the ground, the "foot" of the L pointing in. That caused the other 2 legs on that side to shift toward the front. Since it isn't on a concrete pad I didn't use the concrete anchors on the middle legs (couldn't could I??). I sank some 6" Timberlocks against the sides of the corner "Ls" so they couldn't rotate and stuck a couple through the holes of one of the side legs into the 2 pieces of wood under it. Yeah, a temporary solution but holding at least for now. A couple of short T posts might be an excellent idea.We have extremely rocky soil soil we didn't even try the anchors. We pounded in three t-posts per side and tied the legs to them. Another thing I found useful was to run rope in a zigzag over the beam and eaves (?) between the purlins (hopefully that's the right terminology). The amount of space between the purlins is large enough that with any snow the roof will belly out and make it difficult to remove. Same with a hard rain. The rope support helps it shed a little better.