I wonder if anyone has used one of those little donut spares
This is what I usually use. Also a tire plug kit and a small air compressor.
Rockies54, my '48 has a bracket added to the bed. Doubt if it is original looking at the weld, however you can have it for shipping if it is something that you want. I will have to cut off the weld I will try to take a picture in the next day or two when I get out to storage where the bed sides are.
Also, if you want to get rid of the dimple/dish/notch, simply grind the corner of the weld to remove the dish, flip and re-weld. That would be reverse of most aftermarket mods to add the dish.