Tailgates, tailgates with integrated workbench structures, vehicle assemblies with the same, and methods of manufacturing, integrating, and using the same are disclosed. The tailgates and other pivoting-structures described herein can include one or more integrated workbench structures that are adjustable into different configurations, e.g., at least a first configuration and a second configuration. This allows the workbench structures to support different functions, e.g., holding, supporting, cutting, drilling, sanding, assembling, and/or disassembling objects, among other things. The integrated workbench structures can include support arms, bracing elements, vises, rulers, fasteners, or other adjustable structures that can be operated, modified, or used in different circumstances. The tailgates and other pivoting-structures described herein can also include elements that provide support in an open position, e.g., in some instances, without the use of cables, arms, or struts.