Hi Robert,
I don't have any experience with the tinplate cars. My only experience is with traditional O Gauge, and very often I need to add weight to the cars to keep them from derailing on switches.
If the tinplate don't need any weight, then no, I don't have plans to add any. (I just assumed that since they are so light, they may do alot of bouncing around.)
Windup, that is a great video. Thanks!
Mannyrock