Thanks for the comment! Since DW considers it the most important feature of the camper, we have spent a lot of time thinking about it.
I'd like the Thetford 260B as well, but I don't think we could fit it under the dinette. From what I read, it's a great unit. It looks like you sit higher as well, which could be handy, our current one is quite low, so it looks like DW and I will have to keep doing yoga or something!