A canopy for a wind turbine nacelle is provided. An orbital sander support such as a plate is mounted on the frame and extends over and above the conveyor belt for supporting at least one orbital sander vertically movably mounted on the orbital sander support, the orbital sander being movable between a lowered engagement position and a raised non-engagement position. The at least one codeword includes the plurality of symbols, and each symbol includes two or more code bits. A hydraulic system is connected to the pressurized hydraulic fluid supply of the vehicle and is operable to control the auger, the roller, and the vertical orientation of the strike-off member and the roller.