When it comes to Engine crane, you should rest assured that the machine would be set on casters. It would make it relatively easy to roll load and unload. However, you could be required to choose the caster suitable to your specific needs, as they would come in different sizes.
The larger ones tend to roll relatively easier on various kinds of uneven surfaces. The machine could also help you lift various amounts of weight. For instance, a 2 ton crane would lift approximately 4000 pounds. On the other hand, a 3 ton crane would be able to help you lift approximately 6000 pounds.