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Instead of supplying the customer with a factory pre-assembled flatbed, cargo container, or other equipment - the customer is given the vehicle with just 'chassis' rails and a 'cab'. This allows the customer to assemble any desired aftermarket equipment; for instance, fire apparatus, an ambulance, or a recreational vehicle conversion package; which can be customised for the specific needs of the customer.
Aftermarket equippers, including coachbuilders, often make their own packages that can be ordered for the truck.
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