As to the Aristo Barber truck and using Aristo metal wheels, the more readily available Aristo ART-29111B wheels can be adapted to use in place of the ART-29111D wheels. The issue to deal with concerns the projecting hub on the suffix "B" wheels. (If you just try to install the "B" wheels in the Barber truck, they won't rotate freely.)
However, there is a method that Aristo Forum member, Ron Wenger, suggested a long time ago that I used and later documented in a vignette*.
That method is to countersink (bevel) the flange side of the brass bushing inserts that goes into the side frames. So doing provides just enough extra distance to accept the ART-29111B projecting wheel hub area so they will freely turn when installed. I've done countless wheel installations this way for the Aristo Barber trucks
* See article, Aristo-Craft Metal Wheel "train accessory" kits and wheel issues
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