Or go with an under the tailgate spreader for a dump body. You need a central hydro system for this type, however you can go from sander to dump truck real quick. Infact because you don't have the extra weight of a 900 to 1000 lbs V-box on the truck you could carry 4 yards of sand or salt or whatever. So if you have a 3 to 4 yard dump body with an under the tailgate spreader you can carry 3-4 yards of material.
A friend of mine has an F550 with a 2 yd V-box and it handles it like its not even there,he even built sides for it to get about 2 3/4 yds in there,still doesnt even know its there.Very heavy duty axle and suspension on that 550.