The height of the exhibition booth is 3m or less usually. 
However, the yacht exhibits to the hall in shape to put up the sail in the boat show held every year. 

For this, the roof of the exhibition hall secured enough height. 

The crane car rides in the hall for the installation of the exhibition thing usually. 
It is likely to be able to understand by seeing figure. When the exhibition thing of the same size is set up, a large-scale crane car is needed when the roof is low. 
The radius of gyration of a large-scale crane car is wide. In another word, the range of off-limits at the installation preparation broadens, too. 
Naturally, it becomes the problem for setting the hall efficiently.

However, when the roof is high, You can set the hall with a comparatively small crane car. The reason is that it raises the angle of the arm. Radius of gyration is also small. 
Because the hall construction becomes easy, consequentially, it becomes a saving of the construction time. 

If the usage of the hall is decided beforehand (For instance, for the hall only for the concert), the crane can be installed in the structure. If it is a multipurpose hall, the method is only the installation with the crane car . 

It is convenient to be able to use a lot of crane cars at a time. 

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