I was interested to see that there is a word that means “inside a car”. Based on the (limited amount of) grammar I’ve seen so far, I would have expected that to be constructed just like any other postposition location word, i.e. 車の内.
Does the latter exist? If so, is there any difference in meaning? If not… why not? And are there any other set words referring to thing + relative location where the standard grammar would not apply?