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Thx Finnegan-
Didn't realize the manufacture difference. I emailed Yates before purchase [even received response fr/Yates himself] and they do have a metal sleeve that lines the inside of the roller, but it doesn't appear to project all the way thru to the end of the outer bushings. These Yates were 'blems' and less than $10 each, so no big loss. I looked at Stoltz at a local Westmarine and don't recall the steel sleeve extending to each end. I'll go back to WM and look closer.

I am using SS shafts; bought a 6' length rem from local warehouse for $6, but its 303 grade [easier to cut and drill].

Reason I chose the 2x6 lumber for bunks was to have some 'wiggle' room for the lateral adjustment if needed. That's the risk with buying a generalized fit, used trailer. Worse outcome is I add the bolt-ons later.

Yes, the most outboard position for these 2x6's will place them within an inch of the the inverted V peak. [If that makes sense]
If they work out, the 2x6's are cheaper and less effort to install than 4 new bolt-on' supports. At least with 'welded' bunk supports, they're no-maintenance.

I was concerned with the lag 'pull-out' strength, but also reasoned that any incidental load is directionally opposite a 'pull-out' force. Agreed on SS lags with locks.

Related: On my last trailer, I used zip-ties to fasten bunk carpet to the bunks; used screws & washers for each end, but zips at 12" intervals along the bunk length. By doubling the carpet on itself, the zips bury themselves and never contact the hull surface. They outlasted the carpet material.