Loading a moving truck does take some planning since items in the truck will move around during the trip. If you have not hired movers, you should begin by loading boxes and heavy furniture into the truck first. Use straps that are provided to tie down items that could shift during the move. Wait to pack all fragile items until last.
After securing all heavy pieces in place, add more boxes. Fill in with bags, lamps and other items that are not as big. Clothing and others items can be added at this point. Make sure all boxes are secure. After you finish loading the truck check to make sure that nothing will fall out when you open the truck later on. Close the truck and lock it so items do not fall out during the trip. When unloading the truck, open the door carefully so you aren't injured by loose items.