Tell that to the guy that grenaded his front diff on his '05 on a small hill climb in our local club...it was nothing major or too technical...but it blew out the front diff all the same. That "stock" rear locker...hate to tell you, it's in no way bulletproof. We had another guy in our club blow out his rear locker to the point he could barely make it home because it essentially caused his rear differential to shit the bed. It's actually a common problem with the '05 Xterra as far as the rear differential. It's had to be replaced on quite a few 2nd Generation Xterras. This guy's experience with the blown rear diff was not unlike the guy with the blown front diff. It was on a small hill climb, nothing that you would call "extreme" like the Rubicon or Tellico. Every truck when modified or used off-road will have parts break. EVERY TRUCK. What we need is an un-biased opinion from an outsider that owns neither, or has owned both to tell us the true pros and cons between the generations.