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I have seen these and did a little research as well as I think the Expy as viewed from the rear looks a little narrow in the track. In fact I am still considering them for my rear axle (1.25" is what I am considering.)
The manufacturers claim that they will handle it just fine. I suspect you may see a little premature wear at your wheel bearings so don't got to far. I also wouldn't suggest them for off-road rock crawling.
If you get them let us know how they work out for you.