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I know this thread is old, but if it helps for any future researchers, I took my truck to a LineX installer for some other parts. He hadn't had his hands on a 19 2500 yet, and looked it over. He commented that the factory liner was pretty darn good. I'm going to screw up the mils thing, but he...
I'm eyeballing a couple on Amazon, but have no experience yet for recommending.
https://www.amazon.com/dp/B0041FXOIA/?coliid=I2YV3QG5IE1MEN&colid=OKLN6Z5FEXR9&psc=1&ref_=lv_ov_lig_dp_it
and
https://www.amazon.com/dp/B0072U6SLG/?coliid=I2QIDLSSUXGCW0&colid=OKLN6Z5FEXR9&psc=1&ref_=lv_ov_lig_dp_it