We tried that test with the Kirkland brand TP from Costco when we bought our TM in 1998. We've used that TP in our homes for several years, and it works well in our present trailer as well as our present home which is on a septic system.
It is recommended for septic systems and that is what you're looking for. There is no need to buy "RV TP" at higher prices than what Costco costs, and you can use it everywhere in your home.
My 2 cents worth,
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