Switch to compost toilet question

[Fecho]

Hey all,
I have a 2020 Thor Quantum GR22 (Class C). I’m looking to remove the current toilet and install a compost toilet.

I’ve been told by a few people that there’s a way to connect the black and gray tanks so that they equalize and just become one large gray tank for the shower and sinks.

Do any of you know if this is possible on my model, and more importantly, how to do it safely and effectively?

Thanks everyone for taking the time to read this post!

Tyler