A broken driveshaft will ruin a radiator. Keep u-joints greased if equipped with grease fittings. Check all cutting edge bolts and nuts of plow and wing. Use facing blades on carbide blades. Clean and repaint during summer storage.
Check threads on manual or air tailgate linkage, adjust and keep well lubricated.
Inspect all body lights for proper operation. Check for proper operation of backup alarm. Check for proper operation of body safety prop. You should wedge a 6x6 under the elevated dump body when working on it. Don't rely on the prop.