Telehandlers are heavy duty work equipments made particularly to work in rough environment. This however, does not mean they could be driven without regard on rough environment. These kinds of equipments have a a lot bigger risk of tipping over or load loss 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, prior to getting on the slope. Using 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 care and take it as wide as possible.
Under any conditions, do not drive across extremely steep slopes. Descend and ascend slopes with the telehandler's heavy end pointing up the incline. Even when the forks have no cargo, the counterweighted rear of the machinery is fairly heavy; hence, it could be required to drive in reverse up slopes. When the telehandler is carrying a cargo, the front of the unit becomes the heavy end, and you will be able to back the machine down the slopes.
On a mixed jobsite, operator training is really essential. The coordinated steering equipment, along with the rear-pivot machines usually operate on the same jobsite where everyone is allowed to use all of the machinery. In this instance, an individual who is used to using a coordinated steer equipment could jump onto a rear-pivot equipment. A very significant difference between how these two units work has much to do with what part of the equipment extends outside of the turning radius.