260lb jet ski?
My 650 sx stand-up was over 400lbs.
I have the same hitch, it was bent downward when I was rear-ended.
Totaled the boat.
I was able to straiten it out by putting a long bar (like the cargo tray) in and putting a jack under the end and hopping up and down till it looked strait.
I still trust it for towing my boat (replaced), but I would not trust it for a heavily loaded cargo deck. I have one too. I was going to put my mini bike on it. but while testing it held the weight but would bounce way more than I would trust for long distance.
The weakness is the 90 deg. angle between the bolts and the receiver.
if the corner was gusseted, or the deep end of the receiver was welded to the backing plate of the hitch mount it would not bend.

But your frame might????