Looks to me like a lot of folks are overthinking what the telescoping stabilizers are intended for and how to use them. They're strictly for stabilizing the lift arms with no attachment on, centering the attachment if one IS on, and preventing that attachment from swinging side to side, i.e. stabilizing the attachment. Triangles work. Simplest form of geometry, and calculus will prove that EVERYTHING is made of triangles. They're a lot stronger than you give them credit for. Look how small the lift arm connecting rods are. The stabilizers on my LX2610 are nearly just as big. If you're getting excessive forces on the stabilizers and bending them, perhaps you should avoid slamming into trees with your attachments while you're doing donuts on your tractor.
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The only thing that's going to bend one of those is a pretty catastrophic impact to the side of the attachment. You're more likely to damage the implement than the telescoping stabilizer, especially if you set them so that you have minimal swing. I try to avoid using the slotted holes if at all possible so that both share whatever lateral forces are created by a swinging implement. If you're pulling on things at an angle, well, simply put, you're doing it wrong.
I've noticed that most of the folks talking about replacing their turnbuckles with the telescoping type have the stabilizers on the outside of their lift arms. If you want the telescoping type to do you real justice, find a way to attach them on the inside from about half the length of the lifting arm, angled in toward the centerline of the tractor. This is the way Kubota put them on the new LX series. There's gotta be a reason they moved them inside, and probably the same reason Ford put the stabilizer chains on the inside as well. Stabilizers are a lot stronger at the sharper angle and don't take near as much adjustment for alignment of the lift arms. I've whacked several trees going past them with my box blade and haven't bent anything yet. I use a 3 point receiver hitch to pull small (<6" scrub) stumps with so that I get maximum lift as close to the rear tires as possible for the most effective pull on the stump. Some have had tap roots at least 4 feet in the ground, and I pulled them without digging at all. I take a strain with the lift, then rock back and forth on them a little with the HST until I hear the roots start to pop. Haven't hurt a thing doing that except a few scratches on the dual ball accessory for the receiver hitch. If I do bend anything in the lift hardware, my wife has permission to take the tractor keys away from me. The only thing I've bent is the top edge of my box blade where I put a shackle in a hole that didn't really want a shackle in it. Can't blame that on the chain, the shackle, or the box blade now, can I? The biggest mistake that so many people make with a tractor is snatching things with a chain. That's just bad practice all the way around. Bad for the tractor, bad for the chain, and if the chain breaks, might get real bad for the operator. If you want to snatch, get a snatch rope or nylon sling. They'll absorb the shock and won't break your toys.