I find the box even handy at home . I can take all cars into the house or out to the track . As well most repair equipment can come with them.
The boxes and trays will hold 18 cars. 5 of them could be 1/24 scale. This box That is equivalent to 3 single layer slot car boxes. That would be difficult to carry at one time.
The whole Transporter with cars and equpiment is easy to lift and carry . It is reasonably light to lift being of plastic construction.
It is easy to separate the two boxes very quickly with the two side clips. Access to each section is a matter of seconds.
The top box could be used independently. That may be handy for meetings where you only need 6 to 9 cars and a controller. - You may have to pack some tools in another small box or forgo a car space or two for the tools and lubricants.
The larger " walking" handle is very quick to snap up & down when needed.
This Stanley Mobile Work Center has been easy to convert to a Slot Car Transporter and is a very convenient size