Fair point, but renting a vehicle most weekends could easily make owning more cost effective.

If you truly need it every weekend, that's a very legitimate reason to buy such a vehicle, if you can't afford the money/room for a smaller commute-friendly vehicle, or similar reasons.

I'm talking about the people who maybe need it once or twice a year, or like to imagine themselves needing it, when in fact they really don't.

The vast majority of people are airily dismissive of the logistics of other peoples lives.

Some people do have a legimate need and reason for owning such an overly large vehicle. Most people dont.

They have a desire, not a need.