BR36

some people say to replace them in pairs: i say they are expensive and only replace the bad one.. and if you replace the wrong one, just swap it to the other side..

EVA Airbr35seat map

It's front end parts on a Jeep. I bet the other one is tired. If you like doing this stuff I'd swap the other side or plan on doing it soon, like when the weather is nice, perhaps this spring.

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BR35eva

Seems logical, but it doesn't actually make sense statistically. I work with equipment that has hundreds of bearings of the same size running at the same speed. You only change the bad ones. And guess what? The other #99 bearings don't start to crap out shortly after. Imagine that...

Right front seems to be the more common one to change, I think due to the greater likelihood of curbing that wheel, plus there are more potholes on the edge of the street, and you generally turn left faster than right, so the right gets more wear.

I learned that lesson the hard way. Only Hyundai Excel I had, the driver's side rear wheel bearing went. I replaced it. Two weeks later, the passenger side went and needed a -lot- of coaxing to come off.. like cold chisel and a hammer

Doing front brakes, noticed it growling pretty bad on the drive over, noticeable play in the front right, couldn't feel any play in the front left (didn't have indicator to check). The left side felt smooth turning it but with the CV shaft there it's hard to tell. It's loud enough I'm not sure it's one or both(or it's actually both), but the bad one being the one that's always in the gutter, I have to wonder if the extra $118 for the second FAG from rockauto is necessary at under 100k miles.

If you can hear the bearing making noise then I would replace it, as you stated the owner uses the Jeep on rough roads, no need to have the bearing go out 20 miles up the trail.