All numbers are from door stickers on my 2022 2500 CC LB Gasser. My questions is around actually towing numbers. GVWR 10650, GAWR Rear 6390, max payload 3473 but max GN as per SAE J2807 is 2460. I'm looking at 5th wheels but it seems that my max GVWR is 11150 ( 22% for hitch weight is 2453 ).
I seem to have quite a bit of room for a hitch and gear. ( excluding full fuel and 300 lb for pass as part of curb weight )
Is the SAE rating based on RAWR max load to safely pass the tests? Wondering why it's almost 1k under max payload, assumption on avg gear etc being close to 1k? I'm not able to get an actual hitch weight sitting on a truck for the rv's I'm looking at.