In most field robots, go or no-go decision depends on the maximum height of a bump. For combat vehicles, however, much advanced capability of the vehicle is required to pass over a higher bump compared to its wheel radius. For this purpose, many combat vehicles are using variable geometry suspension (VGS). In this paper, a 6x6 vehicle with a rotating VGS was designed. Computer simulations of the designed vehicle were carried out with the ADAMS program to estimate motor capacity and the required torque. The suspension was designed to rotate 360 degrees about the swing axis, thus, the vehicle could climb a higher bump by rotating its suspension.