I've been buying most of my N scale rolling stock via eBay simply due to cost. As a beginner, I needed to get trains up and running quickly. Much like a protottype railroad just starting out, I bought a lot of used and obsolete stuff. Anyway, I have a selection of Atlas, Minitrix, and other oddball stuff (no Bachmann or Micro-Trains). Some of them have 'issues', mostly to do with trucks or wheels. My question is, are there any brands I should stay away from in regards to replacement parts (trucks, etc) or that won't easily take MT style couplers? The bulk of the cars parked on my service siding seem to be Atlas, FWIW.