Agricultural vehicle

The agricultural vehicle (10) has a determining unit that determines and specifies the attachment portion to-be-attached to a coupling device (21). An electronic control unit (62) regulates the tensile force as a function of the working depth of the attachment portion. The determining unit determines and specifies the slippage between base portion (11) and tire (18,20) of the vehicle portion. An electro-pneumatic tire pressure control unit (16) controls the tire pressure based on the tensile force, working depth and slippage.