In due time, specifications came through, for a tough, fast, comfortable vehicle, mounting a camper top – a little house with double bed, a four-burner stove, a heater, refrigerator and lights operating on butane, a chemical toilet, closet space, storage space, windows screened against insects – exactly what I wanted.

What is the purpose of the descriptive detail in this passage from Travels with Charley?

It shows that the author has a lot of money to buy a fancy camper.
It shows that the author is a very fussy person.
It shows how the camper meets all the author’s travel needs.
It shows that the author is a good designer.