2013 Toyota Tundra Regular Cab Owners Manual - Page 228
2013 Toyota Tundra Regular Cab Manual
Page 228 highlights
2-5. Driving information As shown in the above example, if the number of occupants increases, the cargo and luggage load will be reduced by an amount that equals the increased weight due to the additional occupants. In other words, if an increase in the number of occupants causes an excess of the total load capacity (combined weight of occupants plus cargo and luggage load), you must reduce the cargo and luggage on your vehicle. CAUTION