i think he means two legged.

 

There are no 2 legged ones. He means a 3 legged one like this one.

 

I second the one with 4 wheels or 4 legs how ever you want to see it. This advice comes from a bad experience with the other.

 

3 legged are....how do you say JUNK!

 

ohhh I see, yeah, just by looking at them I would think you'd need a couple of sandbags at the far end. Looks like it'll tip over easy. I could see one of my wifes cat's jumping on the ol engine late at night. Squish...