Scissor jacks are easy to use and do a great job at leveling in most situation. In fact, they’re the most common type of leveling jack. Scissor jacks are easy to use. A small crank is connected to the scissor jack. When turned, it turns the screw section within the jack. That, in turn, moves the two ends of the jack closer together, pushing the arms upward. When closing, simply screw it the other way, the arms spread apart and the jack flattens out for storage. You might need some kind of block or brick to put under the jacks if the ground is soft. A leveling block placed under each usually does the trick. Unfortunately, scissor jacks are fairly heavy, and you need a good place to store them in your RV. But they are great for leveling in many situations.