THE 5th WHEEL / SINGLE wheel car and truck trailers and measuring wheels

[grobmotorix]

This thread is dedicated to all those 5th wheel contraptions
that have been invented to serve as

- gas generators,
- measuring wheels or mobile dynos
- simple trailers or
- anything else we might have never seen before.

> Any ONE-WHEELED photo contributions are welcome!

[grobmotorix]

Some more:

[grobmotorix]

...and my last batch - now I do hope for your contributions.

[Wendax]

En miniature:

[grobmotorix]