Actually, if the current MB SUV's are like my wifes 02 ML320, the 7500 lbs is with or with out passengers. One has to stay with in the payload of the rig tho.
Also that rig is rated to 7500 lbs no matter if you have the diesel, or the 3.5L v6, or the 5.5L v8 supercharged version with more hp and torque yet! MB has rated this rig as they do in Europe to a degree.
As noted tho, if you do a typical NAmerica 10-15% HW, vs Europe at 5-10%, you will over load the factory hitch ratings. Not sure if another one is out there with a stronger HW rating.
Power wise, you should not have too many issues with a loaded 7000 lbs trailer with that motor.
Keep your self with in the general specs of the hitch etc, enjoy the time with family.
Marty
