Studio carts are such an important item for any sort of film making, the amount of equipment require, contrary to popular belief, is astonishing.
Stands alone can amount to hundreds of units. A well managed movie set, with the many different departments all have a management system of military precision.
Reason being the equipment is expensive and needs to be handled by technician who are trained, also and the major reason is movie making is expensive, every minute runs at thousands of dollars, so all on set gear needs to be easily accessible, ie C stands, frames, clamps, flags, gels.
Studio carts is a perfect way of having you on set gear close by. Rocket designs and fabricates studio carts for lights, frames, on set gear, stands, shot bags,
rigging gear, and many other items.