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My 2003 Big Sky did not have heavy duty shackles as far as I know. If they were heavier it didn't make any difference because it was the nylon bushings that failed causing the shackles holes to elongate. There is only one size spring eye and bolt going through the eyes so there can only be one size of bushing.
While I am really pleased that Bill has not experienced failure in this area, unless the shackle material is thicker as it is on the Dexter upgrade, I fail to understand what else could be called "heavy duty". Sorry, Bill, but from an experiencial stand point, the "heavy duty with nylon bushings" story sounds like smoke and mirrors. I would continue to have the shackles inspected at whatever intervals you deem appropriate.
I do, however, agree with your service man about axles and wheel bearings. Most shops now have a machine that repacks the bearings rather than hand repacking. Physical inspection makes good safety sense to me.
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