I'm a big fan of load tests. I too was one of those, oooooh, battery is now 4, I better replace before I get stranded.
For real, my BMW battery is now 12 years old.
With a Costco 24F, my LS430 is on its 2nd, approaching 3 years old. It does have the free replacement, I heard here the warranty policy has been changed.
The last one did fail a load test at 4 years old. I've not really had problems with Costco ones and before, it was the free replacement no questions asked policy that sold them in my mind. Now that that's gone, dunno.
My opinion is it's heat and the quality of the battery. Meaning, if vibration is in fact a contributing factor, it's due to poor construction.
One thing I will say again and again, I pay attention to "sleeves" and vent tubes. I didn't on my Maxima and wouldn't you know, the front left fender rusted from the gassing. i.e. I threw away the plastic sleeve my first change--actually the real reason was I took a group 35 that my parents had and put it in place of the 24F the car came with. Back then, cold weather pkg cars got 24F, and others 35. So I felt I wasn't breaking any rules by using the 35. So I threw away the sleeve sized for the OE battery. Next time, I went 24F without a sleeve...