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I'd be interested in knowing what model and size of Nexen tire the 2015 Promasters are coming with from the factory. I had a look at the Nexen USA web site and they don't list a tire in the OEM size with the OEM load capacity.
 

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2014 Ram Promaster 2500 159" diesel
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Nexon 13353NXK Roadian HTX RH5 LT 235/80 R17 120/117R 80psi 3,085 2,835 80psi max with a third less of the warranty of the non LT tire's.
Non-LT Mileage Warranty: 65,000 mi
LT Mileage Warranty: 40,000 mi
This is the spec for the Ram 3500 tire from Nexon
 

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Nexon 13353NXK Roadian HTX RH5 LT 235/80 R17 120/117R 80psi 3,085 2,835 80psi max with a third less of the warranty of the non LT tire's.
Non-LT Mileage Warranty: 65,000 mi
LT Mileage Warranty: 40,000 mi
This is the spec for the Ram 3500 tire from Nexon
Thats the Ram 3500 pickup. I wonder what they are putting on the Promaster.
 

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I found an article online confirming that the 2015 Promasters will have the Nexen Roadian CT8 HL as the OEM tire, in the same 225/76-16 size as the current Continental Vanco.

These tires have a load range of 2,680 pound per tire. The GAWR of the rear axle for all Promaster models is listed as 5,291 pounds, or 2,645.5 pounds per tire. That's really not a lot of excess capacity. I guess it's legally enough, but personally I would have liked a little more 'wiggle room'.
 

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I found out at the Dodge dealer that the Nexen Roadian CT8 HL has a load index of 115, 2680 pounds, as GapRunr pointed out. There are much cheaper replacement tire options than the Nexen in that load index.
 

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Dynamax REV 24RB Rear Axle GAWR Tire Overload

I just bought a 2015 Dynamax REV 24RB. I filled gas tank at Flying J and rolled on the scale to compare vehicle wet weight to 9350 lb GVWR, 4629 Front GAWR, 5291 Rear GAWR. CAT scale weight (no occupants or cargo other than water, gas and propane) 8500 lb Total, 3340 lb Front, 5160 lb Rear. OK but don't add more than 130 lb passengers and cargo on rear axle or you exceed rear GAWR! If I carry someone with me they need to sit in front passenger seat not any of the 4 belted seats in rear. If I carry passengers in all 6 belted seats I need to dump ALL water, propane, and gas before driving???

I called Dynamax who said dry weight when vehicle left factory was 3189 lb front, 4859 lb rear, 8048 lb total. Therefore they pasted the 1108 lb allowable cargo weight sticker inside the door. The factory dry rear tire weights were 2317 lb left, 2542 lb right vs 5291 lb GAWR / 2 = 2645 lb at 72psi. When I filled gas, propane, and water tanks I probably exceeded the right rear tire capacity with no occupants, cargo, or trailer tongue weight?

I think Dynamax is fraudulent and deceptive because I questioned tech support about how they define cargo weight before I bought. He blew me off until I got the dealer on 3way. Then he only stated 1108 lb allowable cargo weight rating without explaining the individual tire dry weights they measure on every vehicle they ship. I could live with 1108 lb cargo if I didn't need to put it all between the front seats.
 
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