A rough terrain forklift is a strong rugged vehicle. Many heavy-duty rough terrain forklifts can carry several tons of material at a time. They are carefully calibrated to provide a counterbalance at the back of the lift that keeps the load from making the lift tip forward. Some models of rough terrain forklifts have four-wheel drive as well as four wheel steering. Most rough terrain forklifts have a hydraulic system that lifts and lowers the forks.