Compost may be discharged from the side or back of the spreader. Consider the size and shape of the area and how you are going to use the compost before making a purchasing decision. For instance, if you want to use the compost as a mulch around trees, a side discharge model may place the compost where you need it. Used manure spreaders are often available, and some equipment companies are beginning to manufacture spreaders again. Before purchasing equipment, test it with the compost you plan to use.
Composts vary in bulk density and particle size.
Another consideration is the weight of the compost and the conditions of the soil on which you plan to spread compost. Be sure that the tractor or trucks that you plan to use can pull the weight of the full spreader. Ask if the compost company has equipment to spread the compost. Lease equipment initially. This will give you a chance to test it with a particular compost under your conditions.