We run them on our JK with 37x12.5 tyres and trail mods they just fit under the flares. If you see our pics they look wider because we also run 1.5" spacers which puts them borderline outside. I wouldn't worry about damaging the outer ring because it's just like any other wheel you take into the bush. We've rubbed ours on plenty of big rocks and they're fine. A can of matt black fixes most blemishes
Recently I needed a replacement part for mine and it was no dramas. Got them within a week. Be careful about the part designation because it defines what tyre you can run. We have BFG's now and can run most other brands on this part number. All it means is the thickness of the internal rubber band that locks the bead. Similar to the staun internal locks. So worst case you could always order a new band.
Be under no illusion, these are a very tough wheel as they should be. Only down side is they are quite heavy, but remember they are essentially a split rim alloy.
Cheers
George.