What teardrop to buy?? Or is that what we want?

We have a Liberty and wouldn't consider towing a RV with it.

You also might re-consider getting a RV with only a dinette for sleeping. IF and I mean 'if' you both fit on it, it would be uncomfortable and very inconvenient to make up the bed nightly and pack it away somewhere in the morning. Personally, I'd rather deal with a cassette toilet than a dinette for sleeping. :) Also, all campgrounds have some kind of toilet facilities. Use it instead of the cassette. Many folks do.