Support answer was helpful, just too late...
I liked that I was given the actual factory specs on the wire as well as justification for why that spec was chosen - a very thorough answer. I liked that the expert offered to engage with a follow up question. What I didn't like was probably no fault of e-trailer...when I googled my question about wire size I learned that 4-way harnesses come in 14 or 16 gauge wire and 14 is the better choice. I only found one supplier that had 14 gauge and e-Trailer doesn't offer that choice. I also did not like that Curt doesn't just list wire size in there online specifications. I was frustrated that it took 5 days to get an answer. I needed to make a quick decision so I ordered the harness from another source before I received the experts answer.