Another option would be a used ALUMINUM Gitzo legset. They did make metal tripods back when nobody made carbon tripods, and they're generally bulletproof items. Make sure to inspect them in person, though, as a lot of old Gitzos have seen very heavy professional use and are a bit sloppy from wear. But if in generally good shape, they'll not fail on you, and frankly, even when they're worn, they tend to be a lot more solid than they'd suggest by appearances.