It would also be nice if I could get some extra trucks to use to try body-mounting couplers on the Atlas cars. To do that, I need to cut off the truck-mounted couplers, so, if I don't like the results, I would be stuck with them until I can find some replacement trucks. I guess I could just put some other 4-wheel trucks of inappropriate design on the cars to try it, and not cut the Atlas trucks until I am sure I want to do that. But, I will still need to buy some trucks to do that, so I would rather just buy the right ones to begin with.
If Atlas won't sell these trucks separately, maybe MTL will make something similar available when their single-window coach is finished?