Simulation is particularly adapted to a comprehensive study of stability on slopes of off roads mobile machinery. Stability is a very important criterion for safety and efficiency, but is usually evaluated only in static case, by calculation or measure. The dynamics of vehicle powertrain, suspension and eventual crane or tools have to be taken into account. The very high number of possible cases (combination of parameters affecting stability) makes it impossible to simulate them all with solid dynamics. A methodology was developed that combines both static and dynamics studies to evaluate the stability of mobile machines for a wide range of configurations and environment conditions with reasonable simulation time. One goal in this project was to determine an efficient computing method that would allow a supervision tool to estimate danger before accident occur, thanks to information from forwarder internal sensors. The methodology itself can be applied to a variety of off-road agricultural vehicles, to optimise design or to compare existing machines. In the particular case of CARETAKER prototype, simulation of driving requested simulation of coordinated digital control of numerous actuators as well as mechanics, which was achieved by simultaneous use of two interfaced simulation software commonly available to industry.