Yes, they will. Car 292 is currently riding on freight trucks which makes for a bit of a rough ride. I believe new all-steel trucks are being constructed in Durango for the special projects group.
The 3 pairs of trucks that the Friends have built are for the Friend's projects as John Cole kindly detailed. Current status is:
Cook car 053 trucks - complete
RPO trucks - complete minus some brake rigging and awaiting paint.
Pullman sleeper 470 trucks - complete minus brake rods and some rigging and awaiting paint
Ian