this may be a stupid question but i'm gonna ask it anyway. Can you run a steel wheel on the rear inside and a Alcoa aluminum wheel on the outside without any issues. I'm thinking it should be no issue...
Many trucks are sold with steel on the inside. In years past there was a disc between to reduce corrosion where the dis-similar metals meet. Something to look at is the studs. Will they be long enough to get a full nut with the thicker wheels?