Abstract: A spreader 10, cooperating with a dump body 11 having a conventional tailgate 20, includes a conveyor 15 extending through an opening 12 in the lower region of tailgate 20 to rest on bottom 13 of body 11 and extend aft of tailgate 20. A hopper 30 underneath a rear end of conveyor 15 receives rearward flowing material that it guides downward to a spinner 50 arranged below hopper 30. The conveyor 15, hopper 30, and spinner 50 are all removable from tailgate 20 and dump body 11 so that the truck can be used conventionally as a dump truck. When used as a spreader 10 with tailgate 20 closed, conveyor 15 conveys material from body 11 aft through the opening in tailgate 20 to spinner 50 at the rear end of conveyor 15. By tilting dump body 11 with tailgate 20 closed, a partial load can be shifted aft against tailgate 20 where it overlies conveyor 15 and can then be conveyed to spinner 50 after dump body 11 is leveled.