You might want to consider buying some leveling blocks for the times you are in an un-level campground. Many state, national, and local parks are au' natural, and you want to be relatively level for the sake of your refrigerator if nothing else. I bought ours at Walmart.
However, I don't think this type of block will prevent the movement of your rig from family members frolicking around. The scissor type jack could work to stop this movement. But I emphasize, I would NOT use the scissor jack to level the RV per se, use the blocks or appropriate jack system to level. Use the scissor type only to prevent unwanted movement once leveled.
Good Luck