1. First, put an empty box with an area larger than the specific gravity below, and then put the heavy objects on the empty box. It will be much easier to pick it up together at this time.

Secondly, it is actually a simple and compact method using the lever principle. In addition, an empty box with a larger area than a heavy object is also one of the reasons why it feels less heavy.

3. Finally, it is very convenient to carry heavy objects up stairs with crawler, and there is no vertical force, which reduces the loss of force.