right from the manual
"The maximum gross trailer weight (trailer weight plus
cargo weight) must never exceed 2948 kg (6500 lb.).
If towing a trailer and cargo weighing over 907 kg
(2000 lb.), it is necessary to use a sway control device
with sufficient capacity. The combination of the
gross trailer weight added to the total weight of the
vehicle, occupants and vehicle cargo must never
exceed a total of 5625 kg (12400 lb.). Exceeding the
maximum weight of the trailer, the vehicle, or the
vehicle and trailer combination, can cause an
accident resulting in serious personal injuries."
-Robert