Steve,
The coupler has some moving parts, metal on metal. Little bit of lube might make things move easier.
The coupler on my '07 is original and I checked it has no service kit. I apply ordinary wheel bearing grease to the ball and some has transferred to the latch. I wipe the ball off and the inside of the coupling prior to connecting. A light grease film beats metal on metal.
Others may/will have different opinions.
Gary
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S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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