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...
I do believe I had a motorhome set up like that. Also I think my 2012 Ram Dually had the Alcoa's or similar on the outside and the inners were steel. The people you are purchasing the rims from should be able to tell you for sure though.
You have a doodle too . . . We have 2 of them Tuxedo Doodles brother and sister