#15 - that contraption has a 1932-39 pattern Czech number plate, registered in Prague. The inscription is intriguing too - 'Schwerölmotor' suggests it might be running on marine diesel - but would that really fit with a 950cc 78PS (76HP) engine allegedly propelling it at 160km/h? Vorntriebwagen indicates it's front-wheel drive. So could it be twin-engined, as 'Doppelenkunz' means duplicate, which I guess can't refer to it having two swing axles, but might it also indicate it having two 'Gangwähler' - gear selectors? So could there be another exhaust pipe on the other side? And where does 480kg come into it? Somehow it looks a lot heavier than that ...
And could the name Otto Smekal be connected wth the Otto Anton Smekal (born 1898) who was later granted some UK patents for improvements to suspensions, disc brakes, funnels and vehicle windows? Whoever he was and wherever he came from, in 1939 he seems to have been living in Yorkshire and died in Bedford in 1966. His 1939 Register entry says he was an engineer.
[Post-WW2 BMC did build a 950cc marine diesel, known as the Vedette, based on the ubiquitous A-series block!]
Oh and re the Tripoli picture - surely it must be from the 1950s, when the site was a US air base?