Every rod, is welded where it goes through a flat. I cut 2X2's, then cut a rabbit in the center to go over a rod, and space the flats @ 16", except the top. Lots of holes to drill, and lots of welds to make..., LOL... But they are very ridgid..!!
Welded tabs on, made from the 1 1/2", 2" long, and put a 3/8" lag screw through it, into the poles, bottom, and header across the top.
They don't seem to chew on the insides. But then they aren't locked in their stalls... They are free to come and go when they want. Everyone has their opinion, but I think it eliminates stall sour, or just plain bored, being locked in... AND..., always fearful of a fire... You never know...
The hay rack always has enough hay in it, what they can clean up in a day, or more..., plus out on pasture.
Now if I could just break these two mares, from being "housebroke"....