Doubles are used in trucking when referring to hauling multiple trailers coupled together. Double trailer trucks, as they are officially referred to, are typically employed when moving through long distances or when larger quantities of cargo need to be delivered from one particular place to another. However, it’s important to consider the special permits accompanying handling various double truck trailers. Some difficulties associated with handling and safety risks posed by the double trailer trucks compared to standard tractor trailers result in special permits. The excessiveness in size of the vehicle makes it more challenging to mage and maneuver it. Advanced shipping skills and caution are hence a requirement when driving double-trailer trucks.