I've never heard of a "Yard Goat".

But, when I was growing up, my father had a "Tote Gote".

Kind of a two-wheeled tractor.... Ugly thing but powerful.

Yeah, I know these units. We've got a later model Ottawa at my company. We use for ferrying our low boy and some equipment trailers around and between our campuses. It is known by various names; Yard Goat, Yard Donkey and a few others, too vulgar to print here, though ;}

We call it,here in Buenos Aires port "torito" (spanish like "little bull" or may be bully?).I prefer "backbreaker".

These kinds of "Cabs" are built to mount on many different chassis. I have seen them on straight trucks that hauled deformed steel bars as the bars were too long to fit on an 18 ft bed. Other shorter steel fit well behind the cab. I have seen them on concrete ready mix trucks as well. Where ever a specific use need is created where by only the driver's butt is seated, such as the yard donkeys/mules etc. trucks with cabs such as these are cost affordable.

TMF

Actually, there's quite a bit of customization on modern terminal tractors, and they aren't cheap. A couple goals are 360 visibility and easy walk-in/walk-out access. The degree of boxiness varies with year and model. Here are some names you can do a Google image search with: Kalmar , Mafi , Ottawa Commando , Capacity , Autocar XSpotter , Terberg