2009 Toyota 4Runner Owners Manual - Page 416

4-3. Do-it-yourself maintenance NOTICE n Driving on rough roads Take particular care when driving on roads with loose surfaces or potholes. These conditions may cause losses in tire inflation pressure, reducing the cushioning ability of the tires. In addition driving on rough roads may cause damage to the tires themselves, as well as the vehicle's wheels and body. n If tire inflation pressures become low while driving Do not continue driving, or your tires and/or wheels may be ruined. 394