I had a similar problem when I upgraded to a Superglide with the same type of jaw. My problem wasn't the hitch, it was the kingpin of the trailer. Long story short, the kingpin wasn't perpendicular and caused difficulty with both latching and unlatching. I hope your issue isn't what mine was. I had to replace my kingpin.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010