Take a piece of stranded wire and flex it as much as piece of Romex wire and see which one breaks first, that's what's going on as the wire vibrates in vehicle. I also advocate the use of marine tinned wire cause it's most resistant to any corrosion and the strands are thinner to offer more flexibility. Ancor is the brand I use but there is others out there such as Pacer group.
Don't I repeat don't use wire nuts on stranded wire if you don't already know, it cuts into Romex and it's how it holds, it would cut the strands on stranded wire. Want to get really good at wiring, read into ABYC codes and RVIA rules and regulations combined with NEC. Remember 3% voltage drop is the max and Blue Seas has a calculator to size up what you need.
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