Our portable wheeled hose reels are not easily tipped over. While the addition of the optional Quad-Wheel Kit does add a bit more stability, the primary factor in the reel tipping over is how tight you set the adjustable cam-lever brake.  More information on the cam-lever brake can be viewed in the first 90 seconds of our User-Friendly Features video.  Also, depending on which configuration you chose, these reels weigh 35 pounds or more and have a 2-foot wide by 2-foot deep base. The center of gravity of the unit is designed to keep the cart upright.