Mopar 20 K hitch issue

I have the Mopar 25k, I have found when unhitching after having the wheels chocked, I have wife in the truck with the transmission in nuetral and the parking brake released, I start raising the trailer of the fifth wheel hitch, until the weight comes of the truck, the truck will move just a bit, if I cannot pull the release, I have wife put the truck in reverse and let it apply pressure against the pin, then the release will pull very easily, and I let wife drive out from under the pin. As said above, sometimes you need to unload the jaws by backing into the pin. Also, you can raise the trailer too far as well putting the pin in a bind with the jaws. I raise it just far enough to see movement between the hitch and pin.