We had a 2016 Ram 2500 with coils. Great ride unloaded or while towing a trailer and surprisingly good flex offroad, but it really struggled to control high center of gravity loads. The coils are mounted in board of the frame rails and with the basic OEM shocks there just isn't enough to control the side-to-side sway. We had both popup and hardsided slide-in campers and needed to add Timbrens and Hellwig swaybars to feel comfortable with either camper.
I suppose the 5 link rear suspension design has more bushings to wear out than a leaf sprung suspension so in theory you could have bits wearing out faster, but this wasn't really an issue for us. In fact, the Ram 2500 was by far the most reliable vehicle I've owned and I really liked the platform other than the suspension design not being well suited to high CoG loads. If you know you're getting a slide-in camper from the get-go, I would only consider a 1 ton on the Ram platform. 3/4 ton from other OEMs is probably just fine.
Another thing to consider is that the dimensions of the Ram trucks are noticeably smaller than the equivalent trucks from the other OEMs because the Ram HD platform still uses their 4th gen cabs unlike the 5th gen Ram 1/2 tons. A crew cab short bed Ram 2500 has a 10" shorter wheelbase than the equivalent Ford or GM truck. This results in a better turn radius and breakover angle, but less cab space and potentially more camper weight behind the rear axle on a Ram. Pick your poison.