Unhitching SuperGlide hitch with truck at an angle

Same as Campinfan, I put the truck in neutral to take off any strain between the hitch and the pin. In some extreme cases, I have had to put the truck in gear with my foot on the brake to reverse the bind (forward if I backed in, reverse if I pulled through). As Campinfan alluded, I have had to do this on previous hitches as well that were not SuperGlide.