Hi Dave,

I haven't heard of one breaking, but they do sag.

I pulled the Posie's Super Slider from my 32 perhaps eight years ago.
Nothing was wrong with it and it was working ok.

Installed a Durant Mono-Leaf in an effort to gain some front end travel.
(I should have notched the frame - you can bet the 31's frame is notched.)
The travel was gained, but now that it's sagged it's about to where the Posie's was.

I did add a 3/8" shim - in addition to all of the shims that Durant supplied - much more and part of the shim pack would be out of the crossmember.

Not sure what's next.

I'm thinking of adding a couple of short leafs to the Durant in an effort to get it back up to where it was originally.

If the Posie's spring would not have been on the shelf, I would have bought one anyway.
Looks like it's gonna work well with the notched front end.