I don't know if we are just abnormally heavy, or our camper is built strange, or we're not setting it up correctly, but every step we took inside would rock the entire camper. This was more than annoying so we looked into stabilizing jacks. There were a lot of options, but they all had mediocre reviews or cost way more than we were willing to spend, so I decided to build my own for under $25. They might not be as fancy or sturdy as the professional ones, but they definitely work.
The basic premise of my design is a set of rods that fit inside each other. After the power jacks are lowered, the clamp on the end of the larger rod is tightened. This grabs onto the smaller rod which is attached to the base of the jack legs. This additional support greatly reduces the amount of sway produced when someone moves inside of the camper. When we are ready to move, the clamps are loosened, and the jacks can raise back up without needing to remove the rods because of the way they are attached with pivot points.