Not to hijack, but we got the same problem. We are camping this weekend with friends have a 2012 281qbxl and they can't find their cable hook up either. Both of us have walked around the camper multiple times, with beer pit stops between every lap, I was beginning to think maybe we had too many beverages already. Any ideas?
TT-2013 Passport 3220BH
TV-2004 F150 FX4, not exactly stock...
with 2001 Kodiak K215: 2010-10, 2011-12
with 2012 Grey Wolf 26BH: 2012-19, 2013-24, 2014-11, 2015-6
with 2013 Passport: 2015-13, 2016-15 booked