My tire is HF trailer tire and is not as big or heavy as regular car or truck tires used by many teardrop and TTT units.
THINK SAFTY FIRST
This is to show what I did I am not a professional just doing the best I can. My design will not be perfict I am learning as I go.
Corrections or better Ideas are always welcome.
It was pointed out that metel ones are stronger and there are many welders both prof. or neighbor out of home type who could weld one for you.
You might want to just make a table and keep the spare else where.
Many SUV's have these but they are made of iron and are secured to the body.
to continue:
I have been working on doing this for years. I even went to the point of looking at Classic car shows and photographing the Custom Kits. Which I plan to also add to my Album.
I have only my hatch at the back and if hit buy a hopefully slow moving car I am done for. I have a place where a bumper can be added.
I also want to add the tire back there and make it swing away so i can open the hatch.
Can you offer any ideas or photo's of yours or others

If you fill unsafe with a tire there you could just do a table/ 3rd light.