These heavy duty jack blocks are one of the most solid buys you’ll ever make, and give you ultimate peace of mind. Made of high-density plastic, these sturdy blocks are built to last under incredible weight and pressure, and have grooves on the top and bottom to allow for easy stacking and leveling. The built-in ropes on the sides make it a breeze to grab and pack up when you’re ready to hit the road. Say goodbye to sagging, bending, or distortion – these blocks hold their ground and make leveling a safe and stress-free process. These might just have a place in our top ten favorite RV products. They’re far superior to the old orange and yellow lego-style blocks, and even though they are be a bit pricier, their functionality, stackability, and easy stowability make them well worth the investment. Upgrade your RV experience today!