Telehandlers are machines which are meant to work in rough environment, however, that doesn't mean that they could be driven without any regard for the environment. These machines have a a lot bigger risk of load loss or tipping over when they are traveling on slopes.
If you do have to travel on a slope, make sure that you proceed slowly and carefully while keeping the load low. Prior to getting on the slope, downshift to 4WD and a lower gear. Utilizing the engine brake will actually help to control the telehandler's speed. Try to avoid turning on a slope if possible. If you must make the turn, utilize extreme caution and take it as wide as possible.
Always try to avoid driving across very steep slopes. Use the heavy end of the telehandler pointing up the incline, when ascending and descending slopes. Even when the forks have no cargo, the counterweighted rear of the machine is quite heavy; thus, it can be required to drive in reverse up slopes. When the telehandler is carrying a load, the front of the unit becomes the heavy end, and you will be able to back the machine down the slopes.
Operator training is extremely important on a mixed jobsite. Rear pivot machines will usually operate on the same jobsite of coordinated steering machines, where everyone is allowed to use all of the machines. In this case, a person who is used to operating a coordinated steer machinery could jump onto a rear-pivot machine. A very significant distinction between how these two units operate has much to do with which part of the equipment extends outside of the turning radius.