Ticki,
The tires will all be the same size. Only the wheels will be (3) @ 10 inches wide/ 6.25 inch B.S. and (2) @ 11 inches wide/4.5 inch B.S., not enough difference to make a difference, but give the wider stance and stability on the rear like I like rolling under the camper weight. Remember too, the fronts will stick out only 2 inches farther than the stock wheels with the same 6.25 inch back spacing.
The rears will be approx. 1-2 inches narrower than I have now with the 4.5 inch B.S.
Another thing. You see some trucks with 10 inch wide wheels all around but with the 3.5 inch to 4.5 inch B.S.The center of those front tires is way out on the spindle causing a LOT of leverage on the outer wheel bearings. I've seen a lot of Dodge unit bearing front ends go south from all that leverage.
If my Dodge had enough fender clearance, I would probably go 38 inchers/beadlocks and 4.56 gears. Yes, those gears are available. And you could get 15.50 wide super singles in 38's, the only ones left. But, the 34.53's will do fine with what I have.
jefe