Telehandlers are machines that are meant to operate 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 much bigger 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 machine while also keeping the load low. Downshift to 4WD and a lower gear, prior to getting on the slope. Using the engine brake would actually help to control the telehandler's speed. Try to avoid turning on a slope if possible. If you have to make the turn, take it as wide as possible and utilize extreme caution.
Always try not to drive across very steep slopes. Use the telehandler's heavy end pointing up the incline, when descending and ascending slopes. Even when there is no load on the forks, the counterweighted rear of the machinery is fairly heavy; thus, it can be necessary to drive in reverse up slopes. Once the telehandler is carrying a load, the front of the unit becomes the heavy end, and you would be able to back the equipment down the slopes.
On a mixed jobsite, operator training is really vital. The coordinated steering machinery, along with the rear-pivot machinery normally work on the same jobsite where everybody is allowed to operate all of the machinery. In this instance, a person who is used to using a coordinated steer equipment can jump onto a rear-pivot machine. A really key distinction between how these two units work depends on what part of the equipment extends outside of the turning radius.