So IIRC those vehicles come in "7 passenger" Trim.
They know between large passengers and leather packages, those payloads have to be high and they're sprung as such within safety margin. The Ram seats 5.
The reality is, payload doorsticker number aside? The Big pickup is a vastly better tow platform.
Giant radiator, the engine, axles, transmission, wheelbase, strong frame, etc etc etc.
On my last generation rebel, The doorsticker was around 900lbs, actually less. I "may or may not" have had a load greater than that in the bed, plus me driving it. I'm not someone that is bent on testing limits and spitting in the faces of engineers, HOWEVER, what I can tell you is that despite the doorsticker, the stability was amazing and it handled it fine.
Think about it component by component. The limiter was not the E-rated tires, that's 3/4Ton category.
Limiter is not the ZF transmission, the transmission was overbuilt and can handle a bigtime GCWR.
The 5.7 Truck hemi is basically the 3/4ton's 5.7 Hemi, it's a robust engine than can handle a rough life of real truck work.
The Air suspension will level out way more than someone should try to test!
My memory is hazy, but I wanna say I've seen a photo of someone's ~2017 Ram with like 2,600lbs of construction material in the back, it was not on the bump stops. I would never, ever do that in a halfton regardless of make. I only bring that up to suggest that the air ride system is robust. Me personally, I would be afraid of trusting it through canadian winters, but
strength? It has it. In spades.
So if it's not the tires, and it's not the engine, not the suspension, and it's not the transmission? IIRC the limiter was the brakes, which were upsized in the next generation Ram 1500.
Despite that 900lb doorsticker, it was a very stable hauling platform mechanically and way preferable to a wrangler with an identical doorsticker. The doorstickers might have been identical, but it was not an identical experience.
I would say the same vs the SUVs with identical stickers. I would much rather haul 1,300lbs of dirty crap in a Ram 1500's bed, vs a (capable) Durango! I know there's safety margin built into the Ram, because they know Cleetus and his buddies will go further, more so with that vehicle class than with others. The Durango, while capable, I do give the edge to a full size pick up.
I would also say the same for a Ram 1500 with a 1,600lb payload, vs a Ram 2500 with a 1,600lb payload. I take the 2500 in a heartbeat. It's a friggin 3/4 ton.
I have nothing else to add that others haven't covered - I'll just be following along to see what you decide!
Pretty exciting, I think the move to the 1500 is a great idea. I'd take a look at some trucks optioned how you like, look at door stickers, see what fits within what you want and what it should weigh, yada yada
Oh, and post photos so we can all high-five you for the truck!