The Beaver by Wheeler Mobile Ltd

Technically speaking the Beaver  is a quad as it has four tires, however, the  steering setup has the two front tires sharing the same shaft. Thus, making the front tires one unit.

I highly suggest you follow the link below to the dedicated site to the Wheeler Mobile company and their products. There is lots to explore with the Penguin and Beaver.

Kevin's Penguin and Beaver Page (google.com)