Check the vertical piece of "wood" the hinge is screwed to. When we picked up our new 2503S last year, there were NO screws holding the street side of this piece of wood to the trailer. Turns out there were only 2 screws on the curb side. Dealer tech added an extra screw on the curb side and then 3 on the street side. When I got home, I added another (total of 4) on each side. The piece of "wood" is some kind of press board, so I figured the more screws the better. May not fix your creak, but sure can't hurt.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10