FORD 2010 Flex v.1 - Manual (Page 125)

ROOF RACK SYSTEM (IF EQUIPPED)
Loads should never be placed directly on the roof panel. For proper
function of the roof rack system, loads must be placed directly on
crossbars affixed to the roof rack side rails. Your vehicle may be
equipped with factory-installed crossbars. Ford Genuine Accessory
crossbars, designed specifically for your vehicle, are also recommended
for use with your roof rack system.
The vehicle’s roof panel is NOT designed to directly carry a load. The
maximum recommended load is 100 lb (45 kg), evenly distributed
on the crossbars. Ensure that the load is securely fastened.
WARNING: When loading the roof rail crossbars, it is
recommended to evenly distribute the load, as well as maintain a
low center of gravity. Loaded vehicles, with higher centers of gravity,
may handle differently than unloaded vehicles. Extra precautions, such
as slower speeds and increased stopping distance, should be taken
when driving a heavily loaded vehicle.
When the rail system is loaded, check the tightness of the load before
driving and at each fuel stop.
Driver Controls
125
2010 Flex (471)
Owners Guide, 1st Printing
USA (fus)