angle of operation for NH TZ22da

Hello, I understand this may be somewhat subjective of a question however can anyone help me find out what is the maximum % of angle a NH tz22da can be operated at safely to mow a side hill? I cannot mow it up and dow as the hill has trees on top and a gully at bottom and must be mowed from end to end.  This tractor is new for me and I have previously mowed this with a Honda all wheel drive all wheel steer CUT 18hp gas tractor that had just a bit lower COG. I have reviewed the owners manual and found nothing. I also know that you are only as safe as you feel however I could use some help on this one with some guidance from you pro's

I don't think anyone can really tell you some magical angle that your safe up to. There are so many variables involved you just can't say. Its really just a seat of the pants feeling. You kinda just know when your in a bad place. If you start to push the limit, and you feel it start to tilt - turn down hill right away.

A TZ does have a pretty low COG as well.
As Neil mentioned, there's too many factors/variables involved.
Is there any way to get a demo version of that TZ taken to your place so you could give it a try?

Hey Guys thanks, your answers were really the same conclusion I had drawn. While I realize sometimes we all push the limits I don't like pushing to a point were I would have to post pics of the ROPS doing its job! .   I just did not know if there was a place to find out where the mfgr had done tets and posted results..

THANK YOU