Welcome to the Forum!
We use Charmin Ultra Soft TP. According to the manufacturer it is safe for use in RV black tanks, and we've had no issues. (Not Charmin Ultra Strong). I have tested a sheet in a glass of water, it seems to break up just as easily as RV specific TP and it's much more comfortable to use.
That said, I believe your Atlas has a macerator, so I'm not certain if that makes a difference.
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Mike
2020 25' Globetrotter Twin | 2024 GMC Sierra 2500HD Denali Ult. 4x4 Duramax
400Ah Battle Born lithium battery string | 580W solar (400W roof 180W portable)
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