I looked up all three 350/3500 HD DRW long box 4x4 Crew 4.10 Ford and RAM and 3.73 GM.
Ford DID list SAE but "ONLY" for the DRW trucks, so take the Ford SRW ratings with a grain of salt.. Their DRW 5er limit is 27,500# that is hitch limited. Their Gooseneck is 31,300# and combined is 40k.
GM towing is 22,700# and does NOT mention SAE anywhere i could find. Their combined is 31,300#. So technically I could not tow my DRV within their ratings.
RAM lists SAE at the top of each chart 2500, 3500 and 3500 DRW.
They base their 30,100# trailer rating on 15% pin gooseneck or 5er. Tripple axle 5er will fall into that category. They have 39,100# combined.
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