Because of accidents at the scrap yard, much less my own I made mine out of upright steel, wood side boards top and bottom, with fencing material stapled to the wood in between. This allows me to repair damage relatively cheap and quickly. I also built mine in sections that fasten together to allow me to remove them by hand quickly. With the wire mesh (game fence) they are light and easy to handle.
My first set was all steel and everytime they got bumped, they had to be repaired. At the very least this involved using a hammer just to get them out and alot of times involved the torch and welder. My .02 cents.
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