Steel may be the way to go, but definitely check if you can get bundles and how much it is going to cost you. My husband and I own a fabrication company that specializes in farm steel items- prices are tripling and availability is almost non existent unless you are buying in bulk. Lots of back ordered and late shipments these days. In Southern Minnesota, we would not be able to get away with PVC as it shatters when the weather turns, wood has had inventory issues as well. Sorry to be a ray of frigging sunshine, umm it was 40 in Minnesota and Sunny today, yayyy!