I've tried to think of what the ultimate vehicle would be, and here's what I've come up with:

It would of course fly, silently of course, it would have one or two seats, like a fighter cockpit, it would be very small so it could fly in tight spaces, it would be capable of virtually any speed, it would have voice command and autopilot that would keep it from hitting anything, you could tell it to fly in a formation with anything and it would hold it's relative position without hitting anything, it could go into stealth mode where no one else could see you, you could listen to anything happening outside of the craft, and last but not least, you could time travel with it. You could travel to any point in time, and observe anything that happened in the past without being observed, and learn the truth about anything in yours' or man's history that you ever wondered about.

How much would you pay to rent the ultimate vehicle for a day?

Now suppose your memory and any photos or recordings of anything you observed while in this vehicle would be erased upon return - you could observe anything in history and know the truth while observing it, but once back, you'd have zero recollection of anything you saw earlier while in the ultimate vehicle, it would be like you never took the vehicle out. How much would you pay to rent the vehicle for a day?

To me its kind of a fun question, it gets to why you'd want knowledge.

__________________
Hold my beer and watch this!

Fred Flintstone car. but it had a front and back seat.

__________________
Carpriver.

I think your vehicle is too much. And why would I want to gain knowledge that I'd lose?

I liked the shuttle on Star Trek (original series) and I liked the X-wing fighters on Star Wars, but thought the nose was so long as to give the same taxiing problem that some airplanes have done if used on a planet's surface.

Not a vehicle, but I admired the Gate in Robert Heinlein's, "Tunnel in the Sky." Enter, pause on the Moon for a moment, then step out onto another planet. Of course, like all high tech projects, it had bugs and left the survival test students stranded on a planet for years instead of the expected ten days. Even in 1958, the author foresaw some of the problems that we have with modern electronic marvels. The Internet isn't perfect, for instance. But what would you expect from something designed by Al Gore?

It probably says something about me that I was more interested in the hero's knife with a 21CM molysteel blade than I was in the Gate's mechanism.

Flux capacitor in the truck in my driveway.