Telehandlers are heavy duty work equipments produced specially to work in rough environment. This however, does not mean they could be driven without regard on rough environment. These types of equipments have a a lot bigger risk of load loss or tipping over when they are traveling on slopes.
When traveling on a slope, make certain that you move slowly with the machinery while also keeping the load low. Downshift to 4WD and a lower gear, prior to getting on the slope. Using the engine brake would actually help to control the speed of the telehandlers. Try to avoid turning on a slope if possible. If you must make the turn, use extreme care and take it as wide as possible.
Under any conditions, avoid driving across excessively steep slopes. Descend and ascend slopes with the telehandler's heavy end pointing up the incline. Even when there is no cargo on the forks, the machine's counterweighted rear is quite heavy; thus, it can be required to drive in reverse up slopes. Once the telehandler is carrying a load, the front of the unit becomes the heavy end, and you can back the equipment down the slopes.
Operator training is extremely essential on a mixed jobsite. Rear pivot machines will often operate on the same jobsite of coordinated steering equipment, where everyone is allowed to operate all of the machines. In this instance, a person who is used to using a coordinated steer machine could jump onto a rear-pivot machine. A really key difference between how these two units work depends on which part of the equipment extends outside of the turning radius.