Telehandlers are machinery which are designed to work in rough environment, however, that doesn't mean that they could be driven without any consideration for the environment. These kinds of equipments have a a lot greater risk of load loss or tipping over when they are traveling on slopes.
When traveling on a slope, make sure that you move slowly with the machinery while also keeping the load low. Downshift to 4WD and a lower gear, before getting on the slope. Using the engine brake will help to control the telehandler's speed. Try not to turn on a slope if possible. If you must make the turn, take it as wide as possible and use extreme care.
Under any conditions, do not drive across very 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 counterweighted rear of the equipment is quite heavy; hence, it could be necessary to drive in reverse up slopes. Once the telehandler is carrying a cargo, the front of the unit becomes the heavy end, and you would be able to back the machinery down the slopes.
On a mixed jobsite, operator training is very vital. The coordinated steering machinery, along with the rear-pivot machinery often work on the same jobsite where everyone is permitted to use all of the equipment. In this instance, a person who is used to using a coordinated steer machinery could jump onto a rear-pivot machinery. A very key difference between how these two units work depends on which part of the machinery extends outside of the turning radius.