Essential for trailer owners. If you own a tent or caravan, you know that even if your wheel chocks are perfectly in place as you walk in the trailer, you're still moving. Most stabilizer jacks are not designed to carry much weight, so generally don't trim them. I figured it was just something to deal with until I stumbled upon it. It's ridiculously easy to set up and I'm really working on getting your hoop in place. I noticed a difference in day and night traffic as I walked into my trailer. Although you can tighten it enough by hand, you can also use a wrench. It seems very durable and I expect it to last a long time. One on each side. That's a great combo! Highly recommended to all trailer owners.