All right, you have made good points, so I will withdraw to defend the following positions:

[1] It may or may not be possible to drive a Tiger heads-up.

[2] Experiments with simulated layouts are inconclusive.

[3] Photographic evidence is inconclusive.

I would personally  be convinced by the movie frames where the Tiger is clearly moving along and a total of 5 people are visible, but as you point out, it's possible that they had a passenger standing behind the driver. So I will stick to [3].

Now, regarding the manual: if the book actually said "near impossible" rather than "impossible", then almost the whole thread has been a waste of time.

See, this is why it's important to check before you publish, and write exactly what you mean.

David