pipes 51 and 52 are simple and easily straightened or replaced if bent pipe 51 is mounted on a disk 54 that is rotatable relative to a fixed disk 55 fastened to the front of hopper 30 a movable detent pin 56 locks disks 54 and 55 together to hold spinner 50 in either the vertical operating position shown in fig1 and 4 or in a horizontal stowed position as shown in broken lines in fig4 hole 57r in movable disk 54 detents with pin 56 in a stowed position that normally disposes spinner 50 toward the right side of the truck and hole 57l is available to stow spinner 50 toward the left side of the truck if desired spinner 50 can be moved to a stowed position simply by withdrawing detent pin 56 and manually pivoting spinner 50 counterclockwise up to its horizontal stowed position this can easily get spinner 50 out of the way for storage transport or use of the truck for towing for example the operating position of spinner 50 is arranged to clear the road bed and swing under the rear of the truck when body 11 is dumped as shown in fig3 driving the truck away from a dumped load removes spinner 50 intact any collision or mishap to spinner 50 is easily repaired by straightening or replacing telescoping pipes 51 and 52 spinner 50 is preferably driven by a hydraulic motor 39 located under spinner 50 another hydraulic motor 60 turns the drive sprockets 61 at the rear of conveyor 15 a stub shaft 62 on sprocket motor 60 affords an available connection to a rotation sensing device for microprocessor control of conveyor 15 this can automatically compensate for relative truck speeds and spreading rates as.