Any motor vehicle with a permanently attached truck or delivery body. This includes tractors, wagons , hearses, casket, ambulances fire apparatus , and buses used for hauling purposes on the highway

An automobile, motorcycle, motor assisted bicycle, unless otherwise indicated on the HTA, and any other vehicle propelled or driven other than by muscular power. Not included are the cars of electric or steam railways or other motor vehicles running only on rails, or motorized snow vehicles, traction engines, farm tractors, or road-building machines.

A motor vehicle, trailer, traction engine, farm tractor, road building machine or any vehicle drawn, propelled or driven by any kind of
power, including muscular power but not including a motorized snow vehicle or cars of electric or steam railway running only upon rails

A vehicle drawn by a motor vehicle, but not a farm implement, a mobile home, another motor vehicle or any device not designed to transport person or property, temporarily drawn, propelled or moved on a highway, and not a side car attached to motorcycle.
A trailer is considered a separate vehicle and not part of the motor vehicle by which it is drawn

A trailer designed to be operated with the forward part of its body or chassis resting upon the body or chassis or towing vehicle.

A farm tractor a self-propelled vehicle used specifically in farming

the combined weight of vehicle and load.

The weight for which the permit has been issue under the HTA. The fee  is based upon
the weight of the vehicle or combination of vehicles and load.