Telehandlers are heavy duty work machines made particularly to operate in rough environment. This however, does not mean they can be driven without consideration on rough terrain. These equipments 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, ensure 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 must make the turn, take it as wide as possible and use extreme care.
Under any conditions, avoid driving across extremely steep slopes. Descend and ascend slopes with the heavy end of the telehandler pointing up the incline. Even when the forks have no cargo, the equipment's counterweighted rear is quite heavy; thus, it can be required to drive backwards up slopes. Once the telehandler is carrying a load, the front of the unit becomes the heavy end, and you could back the equipment down the slopes.
On a mixed jobsite, operator training is really essential. The coordinated steering machines, along with the rear-pivot equipment normally work on the same jobsite where everyone is allowed to use all of the machines. In this instance, a person who is used to utilizing a coordinated steer machinery could jump onto a rear-pivot equipment. A very key difference between how these two units operate has much to do with what part of the machinery extends outside of the turning radius.