So the trucks modulars would be manufactured at the Dubai facility, then shipped to North America, This is the plan at the moment. This could change if other facilities are added like one in Europe and one in North America.
It is quite right that if a component was to fail the modular would be taken out and an exchange modular fitted to allow the truck to get back in service as quickly as possible. The modular would the be taken to the service depot ware it would be looked at and repaired by a technician then placed back into the exchange storage area. Training for the technician can be done quite easily as technicians are usually quite smart and most of the basics are very similar to what they would already know.
Its like having a technician working for say Toyota working on Toyota trucks then moving to Equipment Depot to work on Cat truck there would be some training but it would be quite easy for the tech to do.
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