I don't like to unhook if I don't have to, especially for a quick overnighter. I usually drop my bags and find a level spot. Your picture got me thinking how I could have a drop leg on the back to hold the truck level if it was too low. Then I thought I would probably forget it and drive off, that wouldn't be good. Then I thought how about an air cylinder plumbed into the brake system, so when I released the brakes with the help of a spring it would raise the cylinder automatically. Hmmmm, now I got to think if it would be worth the work.................