I don't have the same trailer so I can't tell you exactly, but I found that it was much easier getting about six feet of extra wire to give me room to work. Doesn't really matter where you put it but I can tell you it can be a pain trying to work with six gauge wire in tight spaces. The extra wire let me make the connections without standing on my head (mine went in under the cabinets in the kitchen).
2012 Chevy Tahoe LTZ - HD tow package
2017 Rockwood 2703WS Emerald Edition