My buddy’s 2018 2500 CCSB 6.7 easily towed a 14k gooseneck loaded with 2 Jeeps between TX to CO without issue. Also 4 guys in the cab. Over payload? Of course. Over GAWR or GCWR? Nope. Stable as heck and no problems. He added aftermarket airbags as he thought it would squat but it handled it so well I think he only had maybe 10-15 psi in the bags. He started at 40 psi he but said it was stiff as hell so he dropped it.
If you’re concerned at all about numbers and your budget allows, get the 3500 and the HO so you’ve got the best of the best. It would be overkill for the 8k trailer but you’ll not have a worry, can step up to a lot more trailer later and those are worth a lot to many people. Even less worry would be add DRW as well and you can go really big.
With the 3500, need to be mindful of the 26,001 GCWR CDL limit and check your state’s towing weight license requirements. That’s partially what kept me out of a 3500 MC at 12,300 GVWR. If I used it to tow my buddy’s 14k gooseneck in TX I would need a non commercial CDL license as the GCWR would be 26,300 thus over the 26,001 limit.
@Monoman Let us know what you ultimately order/buy.