Alan, if I had to go to a supermarket and tow a trailer, it would feel like the wife was coming along and then we would have to go in the car.
On the bike that is my world, what fits in the panniers and top box is all you need, leave the just in cases at home.
Swag, sox, jocks, maybe a spare t shirt and a few minties to chew on..........wind in the face blue sky and so on and so on.
OK I will stop and get ready to go back to work so I can pay for the dream.