Pete,
I will look into the Red Caboose couplers. Are they just called "fixed knuckle couplers", or something? I know the Bachmann's aren't the greatest, but I have a number of them and many are "different", i.e. hoppers, tankers, gondolas, flats, etc. See, most of my "real" MTL cars are boxcars. I'd like the B-manns to add "interest" to the consist. I'll check into the MT 1128/1129s too. Why do you say they are a pain?
Yes, I am converting passenger cars. I have 5 Amtrak cars that won't ride over the "guards" of my Atlas turnouts. I discussed this earlier. Three I know are Con-Cor. The other two, I really do not know! The 2 "mystery" cars are 6 wheelers. I bought one set of MT silver trucks, #1018S. (That's all the LHS had on hand.) I had to take the car apart and place a "collar" inside to accommodate the narrower MT bolster pin. I also had to screw the "adjustable" coupler assembly to the truck frame. Boy, does it glide nicely now! I can't wait to get the others done! The 3 Con-Cor cars are 4 wheel trucks and it looks like I'll need 3 pairs of MTL-1017S for them.
All in all it has been a very rewarding experience so far.
Marc 😄