If you are talking about the piano hinge between the unit and door then I would suggest 5200 fast dry silicone. I used this on my last unit to hold the locks in place and have used it on boats the same. It takes 24 hrs to set up, but once it's dry it's on for good.
Another avenue would be a 2 part epoxy of some sort, but they do not flex like the silicone does and being a moving part you are in and out of I suggest the 5200.
A picture might get more suggestions and fixes.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's