Telehandlers are machinery which are designed to operate in rough terrain, although, that doesn't mean that they could be driven without any consideration for the environment. These types of machinery have a much bigger risk of tipping over or load loss when they are traveling on slopes.
If you do need to travel on a slope, make sure that you proceed carefully and slowly while keeping the load low. Before getting on the slope, downshift to 4WD and a lower gear. Using the engine brake would help to control the speed of the telehandlers. Try not to turn on a slope if possible. If you need to make the turn, take it as wide as possible and utilize extreme care.
Under any circumstances, do not drive across excessively steep slopes. Descend and ascend slopes with the telehandler's heavy end pointing up the incline. Even when the forks have no cargo, the machine's counterweighted rear is fairly heavy; hence, it could be required to drive backwards up slopes. Once the telehandler is carrying a cargo, the front of the unit becomes the heavy end, and you will be able to back the equipment down the slopes.
Operator training is hugely important on a mixed jobsite. Rear pivot machinery will normally operate on the same jobsite of coordinated steering machinery, where everybody is allowed to utilize all of the equipment. In this case, a person who is used to using a coordinated steer machine can jump onto a rear-pivot machinery. A very key distinction between how these two units operate has much to do with which part of the machine extends outside of the turning radius.