I have a 2021 Grandby front dinette. I initially wanted the extra capacity of a Thetford 365, but it was just a little too tall to fit in the cabinet. I didn’t want to alter the cabinet face, so I bought the smaller 345. I’m glad I have the smaller one now. It’s plenty heavy when full of water, and it still is a bit of a wrestling match getting it in and out of the cabinet. I have not wished i had more capacity either. Because it’s smaller, I often take it along in our yukon on long day trips.