Leveling blocks are almost too simple, yet are very effective at leveling a camper or RV. Also called jack pads, stacker blocks or levelers, a well-designed set of blocks will level your trailer quickly and efficiently. To use them, simply stack however many blocks you need to raise your trailer to the desired level, creating a ramp shape with them. Then back your camper up on the blocks. Once there, you can leave your trailer on the blocks until you are ready to break camp. Leveling blocks even work well on soft surfaces, a condition for which most jacks aren't well suited. Block are also commonly used to place under jacks to keep them from sinking into soft dirt when raised.