Jim, do you have the Goodyears on your '04? I'm betting you do since they are about the only ones that make this size that Dodge deals with. They are junk. Oh, by the way. If you got 50,000 miles out of them, then you should be somewhat content. They are only warrented for 50,000 miles.

I'm not being a smart-alec, just pointing out what I found on their website. I know, I know, a dually should get better mileage. BUT, they're Goodyears. I, too, think they're junk, and am expecting to replace them sooner than I'd like.
Regarding load range. Load range E is betther than load range D. It's not rocket science. BUT, look at the actual numbers. They are rated at just over 3,000 lbs. I think dualled, the number is less just like every other tire. So, if you get 285/70's and look at the numbers, they will be real close to the Goodyear's. So, let's say they are 3085 lbs single, and 2750 lbs dualled. 2,750 times four is 11,000 lbs carrying capacity on your tires. That's a lot of weight, my friends. I seriously doubt you'll put that much weight on the back of your truck. And that's weight ON the rear tires, not what you are pulling behind you. So if your truck weighs 7,500 lbs, and you have a dually, you probably have about 2,500-3000 lbs on the rear when empty (I'm just guessing, I haven't weighed mine),and you hook up a 15,000 lbs trailer with a tongue weight that's 25% of that (that's a heavy tongue, I'm just doing worst case) then you still only have 6,750 lbs on the rear of your truck. If your tires are all inflated properly, you should have no problem.
Now, back to the original question. Will they fit without spacers?
SOLER