Me three.
In the nothing-is-ever-simple department: when BLMA trucks first came out, their lowered bolster and fine wheels made me a convert, but it also forced me to adopt body mount couplers, which led me down
a certain rabbit hole. Then, when FVM came out with resistor-equipped wheels, I decided to standardize on those (with BLMA trucks). Now I'm looking at an MSRP of $11.85 per car (not including couplers) to go that route. That's a bit much...

I suppose I could harvest the wheels and sell them, but I'd rather not. Hence, me three.