I too have the Diamondback HD from 15 , same as the one pictured and couldn’t be happier. Dad bought the rollback from the dealer back in 2015 and it looks a lil worn out. I just bought a 2018 L5P and going to transfer the Diamondback to the new truck, no issues. Btw, line x wears great and you can load up on top of it with no issues, should really check out their website and see the videos.
Stock 2018 Duramax L5P
Diamond Back bed cover-line-X black
BadAss font bumper with winch mount
12000 MileMarker hydraulic winch