According to the Keystone Color-Coded Unified Wiring Standard Tech Guide," 10-gauge purple appears in the "Power Feeds & 7-Way Trailer Connection" chart for "Electric Slide-Out Feed/Single Conductor." I can't imagine that a slide-out feed runs through the 7-way connector, but they share the same chart. Every other purple in any of the charts belongs to a slideout category and is also 10-gauge.
The only other color approximating purple is some pink leads -- an 18ga to the water heater, 14ga to most of the accessories, and a 10ga to the 12V accessory outlet.
If you search around the forum for that document title, you can find your own copy.
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2019 Cougar 26RBSWE
2019 Ford F-250
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