Leveling blocks are extremely simple products that do a complicated job quite well. These are sometimes called jack pads, levelers or stacker blocks, and they’re capable of leveling your trailer very quickly with minimal work. To use them, just stack however many you need together to get the desired level, then back your tire up on them. Some fit together much like Legos, allowing you to make somewhat of a ramp with them. One especially good thing about these blocks is that their wide, flat bottoms allow them to work well even on wet, soft surfaces. Consequently, they are sometimes used as a base to rest various kinds of jacks on when using jacks to level campers and RVs.