WD hitch TW rating as close to actual TW as possible?

So a suggested WDH for my application would be?

When I look at THIS WD HITCH (as an example only) it says 600-1200 lbs.

I can obviously handle the TW.
However, it would go well 'over'.
Is that acceptable?
Too much?
...or would it just be a good cushion for varying TWs the TT may have on different occations.