I am in the camp that one should not exceed the GVWR. Which is why we went from a F350 SWR to a DRW.
Did some virtual window shopping and found this. It is interesting.
for 2020, found a F350 SWR with a GVWR of 12400 and a 3.55 rear end
Same dealer had a green sticker F350 DRW with a GVWR of 13000. 3.55 Rear end. Only 600 pounds more than the SRW.
The Blue stickered F350 DRW was still at 14000. It has the 4.10 rear end.
Had a SRW been out there with a 12400 rating that may have been the direction we would have gone.
Without DW, W/D and 46 Aux fuel tank were right at the 11400 our F350 srw was rated for. I do not think that what we have added would push usto another 1000 pounds to the GVWR.
Not sure if Ram and GM have followed the weight ratings