I'm writing with what may sound like an odd request. I model in 3-rail O and use Ross track and #4/#5 switches, so I'm often able to use 2-rail cars which I've found I prefer (for obvious reasons). Older wheelsets with slightly deeper flanges work most reliably - I've gotten a few cars with more modern wheels that pick switches (although modern Atlas 2-rail cars seem to work fine). What make/era of wheelsets and/or Bettendorf trucks would fit the bill? Bear in mind, it should be something not too impossible to find or unaffordable. I have 16 wheelsets that don't work for me available to trade, if anybody's interested. And no sermons about how I should just go completely 2-rail. 
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