Abstract: The roll-up stabilizer includes an elongated aluminum stabilizer bar that is square in cross-section. The bar is U-shaped and is bent at both ends to form the arms of the “U”. Each arm has a curved portion and a straight portion. An axle for a wheel is welded or otherwise attached to the end of the straight portion of each arm and a wheel is rotatably secured to each axle. A sheet metal trough is affixed to the central part of the middle portion of the bar by welding or other suitable fasteners. The trough is shaped to hook over and center the stabilizer bar upon the top rung of a ladder. Toggle clamps are secured by welding or other suitable fasteners to the stabilizer bar or to tubular sliding members on the stabilizer bar in position to secure the bar to the base of a ladder rail that is I-shaped in cross-section in a position adjacent the top rung of the ladder.