How do you prevent the floor moving? I want to use these tiles in snow plow trucks, and I do not want to drill holes.

To prevent movement of our Rugged Grip-Loc tiles, you will want to place them side to side in the snow plow. When fully installed, the weight of the floor will help to keep the tiles in place. If there is still movement after installed, you could use a pressure sensitive adhesive to keep them in place.