Just a quick snapshot of the 'spare' on the back of a camper trailer.
I just found it unbelievable that; 1) they would save such a thing; and 2) they'd bolt it on the back for all the world to see.
What a mess!
My guess is they wanted to keep the rim, bolting it on was the only / best place to store it, and they could not cut the old tire away. I would have done the same thing (but probably covered it in a black plastic bag with tons of Duct tape) "if a woman doesn’t find you handsome, she should at least find you handy" (Red Green)