I don't know about this. Doesn't a "used" car also means it could be a trade in and if the previous owner replaced the Bilsteins with something else, then that's not the Dealers problem? Certified just means that the X passed all regulated inspections for resale regardless of what aftermarket parts that were installed on the X before the trade in. I mean, I could be completely wrong here but that's just my guess.
But for reference, I have a 2014 Pro-4x and it came with Bilsteins 4600 and BFG all terrains 265/75/16 and the 2015 came with Hankook Dynapros AT 265/75/16.
But for reference, I have a 2014 Pro-4x and it came with Bilsteins 4600 and BFG all terrains 265/75/16 and the 2015 came with Hankook Dynapros AT 265/75/16.