FORD 2013 F-550 v.2 - Manual (Page 243)

WARNING: The appropriate loading capacity of your vehicle
can be limited either by volume capacity (how much space is
available) or by payload capacity (how much weight the vehicle should
carry). Once you have reached the maximum payload of your vehicle,
do not add more cargo, even if there is space available. Overloading or
improperly loading your vehicle can contribute to loss of vehicle control
and vehicle rollover.
Example only:
242 Load Carrying
2013 F-250/350/450/550 (f23)
Owners Guide gf, 2nd Printing, December 2012
USA (fus)