Thanks for the reply, Bryan. On the one hand, I am very glad that you and ESM care enough to supply the correct trucks for different versions of the gondola.
On the other hand, I am disappointed that (apparently) so few of us care about such things that it isn't worth MTL's time to package these truck variations and put them on store shelves (without couplers attached).
At any rate, I am very pleased with my "old" ESM gondola, and will no doubt pick up a couple of this new run as well.