We feel your pain about the problems of unhooking your Vue when it's not completely level or straight behind the motor home. We, too, have a Vue and have a found a way to deal with the problem. If we're on a slight hill, we turn the car on and put it in gear or reverse and that will loosen the tow bar enough to get the pins out. If we're not exactly straight behind the motor home, we turn the car on and turn the wheel as far as it will go to the right or left (You'll need to experiment to see which direction works for the conditions.) and the pressure is taken off the tow bar enough to take the pins out. We have had great success with these "tricks." We hope they work for you, too.
We don't want to take the fun out of finding solutions to life's little challenges, but perhaps having one less challenge might be a help.