The MTH truck sets I've ordered should be here next week. They are ready made 2 Rail trucks. So I don't believe I'll have any problems with wheel size or journal size. As mentioned by others above, they're (obviously) just made to match and easily 2 rail existing MTH cars with their proprietary kingpin mount style and off-set for tighter radius. Ready to roll and prepped for wiring, I couldn't beat the price at $26.95 a pair, even with the need to modify.
I ordered the Atlas truck sets first because Eddy said he uses them and for a reasonable price he knows they work with his kits. I have half 7071 (black) and half 7070 (silver) because nobody seems to have enough in stock. I figured I'd re-paint them all a matching black if I decide to use them. New in box I figured I'll just sell them if I use the MTH.
I ordered the MTH after seeing the detail prototype matches better to a 41-N type. Plus all the same color. 10 for the 401 Models Kits I'm getting and an 11th for a possible future Parlor Observation Car kit Eddy is still developing. He agreed the detail is awesome on the MTH truck, but the design is problematic.
I'll post pictures of what I do and progress with these cars on the O Gauge C&NW photo thread...
https://ogrforum.ogaugerr.com/...c/151773314445966457
Thanks again for the suggestions.
Will