Final answer:
A tractor on crawlers is the least likely to be considered mobile equipment under a commercial auto policy because it is mainly designed for agricultural use and may be able to navigate public roads.
Step-by-step explanation:
Under a commercial auto policy, the term 'mobile equipment' generally refers to equipment such as bulldozers, forklifts, and similar vehicles that are not designed for use on public roads. Among the options provided:
- A bulldozer, which is typically intended for construction-related activities, is considered mobile equipment.
- A forklift, often used in warehouses and construction sites, is also classified as mobile equipment.
- A street sweeper, provided it is self-propelled, is usually classified as mobile equipment.
- A tractor on crawlers, while it shares similarities with construction equipment, is primarily designed for agricultural use rather than construction or industrial applications, and may not always be considered mobile equipment under a commercial auto policy, especially if it is capable of navigating public roads.
Therefore, option 4, a tractor on crawlers, is the least likely to be considered mobile equipment under a commercial auto policy.