I too bought some of that wire. Yes, the wire itself is very flexible and the insulation is very thin (so the overall diameter is small), but overall it is much stiffer than the super flexible wire from Ngineering. While this wire seems perfect for wiring decoders, it would not be my first choice for truck feeder wires.
I'm also questioning the 36AWG specs. The wire measures 0.010" in diameter which makes it 30AWG.