@D500 posted:Here's a thought - keep the old plastic Atlas trucks. Really good-looking, and their dummy couplers mate with standard 3RO couplers dependably, and they "operate" as well as some of the "operating" 3RO couplers (Weaver plastic, for example; heck, some Weaver die-cast examples) do in actual practice. I do snip off the vertical uncoupling rod, as it is useless in my environment.
The cars are light; weigh them down a bit.
I actually use the Atlas plastic trucks to upgrade old 2RO to 3RO, or get rid of the high-bolster, low-end plastic 3R trucks.
I do this too.