I’ve had a 2009 1st year Crewcab Rambox 1500 Hemi
Put 442,150 on this truck using for work
2015 Ecodiesel Longhorn put 48,000 no problems with Ramboxes
2019 - 2500 Megacab Rambox 4wd , Cummins, 1800 miles nothing yet
2020 Lonestar 1500 Crewcab Rambox
1800 miles( replacing 2009)
No problem yet
Only your 2020 Lonestar (Gen-5) is potentially in the problem group. All of your other trucks (including the 2019 2500) are the Gen-4 Ram Box design.
Congrats on the 442k miles on your 2009 truck! How did you maintain it, and what problems did you encounter in that 442k miles?