Garvey- if you need something from grocer or another store in a hurry, why not use the electric carts?
I am a stumbling C5-7, walker walking is exhausting, but I can bum my way up and down stairs and pull a laundry bag behind me with a rope, or toss it down ahead of me. This works fine as long as you keep a walker or old chair in the basement.
There are lots of easy adaptations you will think of once your mind starts to click on this.