On my previous dually truck I ran LT265/70R17 E
Nitto Terra Grappler, and I was very pleased. I had about .25 inch space between the dual tires when bulged at the bottom when loaded. This tire was wider and just slightly shorter then the original 235-80-17 tires and very quiet for the life if the tread. This tire gave me better off road traction and I had no problems with the on road traction either down here in the South.
On my new 2020 Ram dually I plan on running LT255/80R17 E
Nitto Ridge Grappler which should give me about a 2 inch taller and 1 inch wider tire than the original 235-80--17 tires. The original tires just look to small to me for the size of the wheel opening and truck for some reason. If I calculations are correct, this size tire should leave me with about a .75 in spacing between the dual rear wheels when loaded. I hope this tire performs like the ones I use to have.
I am running 35x12.50R17LT E
Nitto Exo Grappler on my Call Of Duty Jeep JKU and love them, however now that they are worn about half way down I am starting to get some road noise out of this tire. I would go with this tire but they don't offer it in the LT255/80R17 E size I want.
I wish you luck. Just remember this is just my opinion and what ever you go with has to make you happy.