Wheel/Tire Fitment Pictures & Info

[BigSky71]

I am ready to order my wheels and tires and can't decide on the size for the rear. I have decided on 255/45 18s [18x8 wheel] for the front but can't decide if I should go with 295/40 20s on the rear or 315/35 20s [20x10 wheel]. I originally planned on the 295s but my tire guy thinks the 315s would look better... I am not sure.

I think that having the sidewall heights match is important so I used the tire sizing guide at 1010tires.com and the 315s theoretically have a side wall height of 4.34". The 295/40s are said to be 4.64". The front 255/45s would be 4.51". I like the idea of 12.5" of tread width on the 315s, but wonder if the tire would look like it needs to be on a wider rim, which I don't want. I don't have to worry about having enough room for the 315s width because I have a shortened rear-end and have tubbed the bed 5.5" on each side. And the truck will have air ride so they have to tuck.

Anyone fit 315s on a 10" rim?