See 2 attachments. Mobile enclosed gooseneck stage trailer. The trailer should provide enclosed transport capability with integrated fold-out stage functionality and self-contained utility features fo... See 2 attachments. Mobile enclosed gooseneck stage trailer. The trailer should provide enclosed transport capability with integrated fold-out stage functionality and self-contained utility features for remote operations and field use. The trailer shall be fully assembled, road-ready, and compliant with all applicable Federal Motor Vehicle Safety Standards (FMVSS) and Department of Transportation (DOT) requirements.