Alcoa has actually redesigned their wheels to allow using two in dual positions. They have tried to keep up with changes made by Daimler Vans over the years. Here is a link to the relevant Alcoa bulletins. First two listed are about Sprinter 3500 wheels.I believe the newer LTV dually's have an aluminum inside wheel, but it is not the shiny bright aluminum.
In any case, you probably want to buy the Borg solid stainless steel valve stems (comes in a kit) if you ever intend to install TPMS sensors.