Not much technology in paddock stands. Bent tubing, few welds, and hole for spools/fork holder. I've only read of rear stands made of welded flat aluminum fail. Why aluminum, i dont know. Steel is quite light, stronger and cheaper to make. Guess some thought lightweight stands are what some want. Pretty shitty if they are not built square. I bought some old, used, steel, Motrax brand front and rear (non spool) stands and they work great and are plenty solid, although rear put a tiny dent at bottom of slip on because they dont quite clear (not stands fault). Could adapt to spools but would need hook spool adapters and spools and would cost more than I paid for both stands, combined. Don't think they sell in N/A as I bought off some guy who originally from UK. Those look very similar. Guess bent steel tubing, is bent steel tubing...