My 200 series is the same, but it doesn't rattle with a van on !!
Previous 2 4wd's had anti rattle bolts, but both had probs.....one snapped the weld off the nut holding the small bolt and the other started wearing a hole into the tongue, so I didn't use it ..
There is a bit of difference between a 2 inch and a 50mm tongue, so make sure the tongue matches the receiver..