certified dealers, usually only awarded to "Five Star" certified dealers), and dealer knowledge is still limited in both sales and service. Special orders typically take one to three months for delivery, and may take even longer due to the assembly and disassembly in Germany, and exporting parts to South Carolina for re-assembly. The exception is passenger van models which are assembled in Germany and exported as complete vehicles. This is because of the United States Chicken Tax. As an unintended consequence, several importers of light trucks have circumvented the tariff via loopholes, known as tariff engineering. Ford (ostensibly a company that the tax was designed to protect), imported its first-generation Transit Connect light trucks as "passenger vehicles" to the U.S. from Turkey, and immediately stripped and shredded portions of their interiors (e.g., installed rear seats, seatbelts) in a warehouse outside Baltimore. To import vans built in Germany, Mercedes "disassembled them and shipped the pieces to South Carolina, where American workers put them back together in a small kit assembly building." The resulting vehicles emerge as locally manufactured, free from the tariff. In North America, most Sprinters are sold as cargo vans to expediters in the United States. Such expediters are similar to truck drivers, except they take smaller loads and will wait after unloading until dispatchers find another customer nearby to transport goods. The advent of the Sprinter van with its cargo space of has allowed van expediters to take three skids or pallets, where previously they were limited to a capacity of two pallets. A Sprinter is capable of hauling approximately of cargo. The vehicle has been adopted by the police in Hong Kong, United Kingdom and in Poland, also and as an ambulance by countries in Western Europe, Scandinavia, the US, Australia and New Zealand. The 515 CDI has become the standard ambulance for use by the National Health Service (NHS) in the United Kingdom, and the Health Service Executive (HSE) in the Republic of Ireland. Another market in which Sprinters are gaining ground is as van conversions and recreational vehicles. Conversions include RVs, limousines, family and luxury vans, office vans, wheelchair accessible vans and golf vans. Sprinter RV conversions can also be called Sprinter campervans. Sprinter conversions have been produced by several RV and coach manufacturers. Chilled box versions of the Sprinter currently make up the majority of the supermarket Home Delivery fleet across the UK, but