The Silver Eagle Manufacturing T-Dolly decreases the gap between combination trailers autonomously at highway speeds of 45 mph or more. The converter dolly can provide fuel savings up to 2.5 percent, according to the company, offers wiggle-free tracking for safety and works with existing fleets. The dolly uses mature components and technologies like the company's sliding drawbar system, speed readings from the ABS system, hydraulic cylinders and pumps.