Many jobs are completed by one or two people with a few tools and materials. These jobs don't require fast, heavy, high capacity, not to mention expensive, equipment such as trucks and tractors. Utility vehicles are compact, safe, require little training, and are easy to use - all at a fraction of the cost to buy, maintain, and insure a larger vehicle.
Utility vehicles can easily carry two people, their tools, supplies or materials, and a modest trailer to their destination easily. They are lightweight, easy to ingress and egress, and consume little fuel (or electricity). And you can add to their capabilities with countless accessories and upgrades like lighting, protection from the sun, racks & storage, power assist, tires & wheels, winches, mirrors, ground clearance, and many more.