Crikey, you really must see this! April 1st 1980-something I remember a hoax in one of the broadsheets about a one wheeled stretcher which had a gyroscopic balancing device, allowing it to motor up or down mountains without falling over, while carrying a patient. Like all great hoaxes, it was feasible because there was enough credible science included....
Meanwhile, way back in the 50s and 60s, this chap was adjusting the centre of gravity to achieve something which Dave Southall had been working on before he found these films, a one wheeled skateboard principle...a tractor which hurtles along with no hint of a wobble.
Who knows, if the principle had been turned inside out, this 1930s tank might have been possible...even without the stabilisers.