The morbidly obesed *are* handicapped. The human frame wasn't built to carry around 400-500 pounds.
Back in the day, I used to park in the absolute back of the parking lot and walk to the store. It was a wonderful walk in the sunshine and felt good. It's a great way to get exercise into your routine easily. I always walked up and down each aisle, too, even if I only wanted to pick up a few things.
Now, I've turned into one of those "you'd damned well better have a placard if you're parked in that spot!" people...but I'm nowhere near as nasty as my husband is.