Im not expert with mud tires, but I was always under the impression that you could run 35s on a level dodge?
Stock tires are 33" on 20s so Id imagine with the truck a little bit extra in the air 35s would fit?
When you say your wheels have an 18mm offset, I assume you mean +18mm? That might be cutting it close with the wheel sucked in like stock but Ive seen it done on other trucks on the forum.
Personal choice for me would be to run the Nitto's. Those trail grapplers are such a sick tire