Telehandlers are machinery that are meant to work in rough environment, however, that doesn't mean that they can be driven without any regard for the terrain. These equipments have a much greater 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 would help to control the telehandler's speed. Try to avoid turning on a slope if possible. If you must make the turn, take it as wide as possible and use extreme caution.
Under any circumstances, do not drive across excessively steep slopes. Ascend and descend slopes with the telehandler's heavy end pointing up the incline. Even when there is no load on the forks, the equipment's counterweighted rear is fairly heavy; thus, it could be necessary to drive backwards up slopes. When the telehandler is carrying a load, the front of the unit becomes the heavy end, and you can back the equipment down the slopes.
On a mixed jobsite, operator training is very vital. The coordinated steering machinery, along with the rear-pivot machinery often operate on the same jobsite where everybody is permitted to use all of the machines. In this case, a person who is used to using a coordinated steer machine could jump onto a rear-pivot machinery. A very significant difference between how these two units work depends on what part of the equipment extends outside of the turning radius.