Ragamuffin Transport
Geriaviator,
When I were a lad (in Liverpool) we called them "trollies". All of them were directionally unstable (and the tramlines were a bit of a problem !)
The "Silver Cross" pram - the Rolls-Royce of perambulators. I've done my stint as the motive power behind one of those. Quite right, there was very little rolling resistance ! Did you manage to get the soap-box on top of the suspension "undercarriage" ? (went on the roof-rack, the "boat" in the car).
Danny.