It's taken me 15 years but I finally did it. Heard others say they done it but I thought I was too smart to do it. I pulled away from my house without unplugging my 30amp.cable.:S
Almost did it with my 50 amp leaving a campsite a couple of weeks ago. Had issues with dead battery in towed and that threw off my whole thought sequence. Started to pull away from the site but looked in my sideview at the last second. Guess it's a good last check to make.