This application is a constructor that will allow you - quickly calculate the load capacity in a standard trailer of 13.5 m X 2.45 m X 2.7 m. The designer has a flexible configuration blocks from the parameters to the color and transparency. Add shapes according to your own parameters in order and take your time. The remaining area and volume are calculated automatically and written in the left corner. The parameters of the opened shape will be calculated on the right side of the screen. You can also calculate the height using a special button. For a visual representation of working with the constructor, there is a simple, clear manual with animation of interaction with the application.