If they are 2 person baskets, they are rated for 500 pounds, so i can't see 50 pounds doing anything. Very odd on the break, that's confusing to me on how clean that is. My only idea would be since it's roughly in the middle between the hydraulic cylinder and the pin, maybe it's flexing and work hardening there, and engineering didn't calculate the cycles to failure or stresses correctly. The other thought i had is if they were somehow dumb enough to splice a section together right there, and then ground the welds flat for "appearance" or trying to hide it or something. I've never seen square tube or pipe break clean like that, so there's gotta be something goofy going on.