1. A simulation device concerning a ground vehicle, the simulation device comprising: a vehicle model comprising a predetermined number of function models configured to simulate corresponding physical function elements of said vehicle; arrangements configured to store said vehicle model and enable simulation of said vehicle; and arrangements configured to engage physical function elements to the simulation device, wherein said vehicle model is developed during development and/or manufacturing of the vehicle, wherein said function models are based on real characteristics of the physical function elements of the vehicle determined during development and/or manufacturing of said vehicle, and wherein a function model configured to simulate a corresponding physical function element is configured to be deactivated at engagement of said corresponding physical function element to the simulation device and reactivated at disengagement of said corresponding physical function element from the simulation device.