Working with a lot of "bagged" material at my full time job. Place cardboard down before you start stacking bags on a pallet. Helps when you slide your forks into the pallet from ripping the bottom ones. Also throw a pallet in between palletized material if you stack them on top of each other. Helps from stabbing the top row with the forks. If you push enough palletized sandbags you might want to look at block trucks or a flatbed that has a forklift on the rear of it. Move material faster.