As far as I know,
Scamp is the only molded option with a wet bath and a chance of staying under 1800# loaded.
Casita made the Patriot Deluxe, but it typically weighs in well over 2000#. The occasional, rare
Trillium Sidekick shows up with a wet bath; I don’t know about
weight. Nothing larger than 13’ has a chance. Even with
Scamp, it will be close.
Dry weights do not include options, gear, or provisions, so the real towing
weight will typically be 400-600 pounds higher in this size trailer. Bath models tend toward the high end of the range. See the thread “Trailer Weights in the Real World” in the General Chat section for data on various makes and models (post #297 links to a spreadsheet).
I’m curious what CR-V model has a tow rating of 1800#. We’re on our second- great vehicles, both- but every one I’ve looked at since 2003 was rated to tow 1500#. I haven’t looked closely at the current generation, though. Because we are four people, we bought a Pilot to tow our non-bath Scamp 13.
If you do consider alternatives to a CR-V, Honda is getting ready to roll out a new model. The 2019 Passport will be a shortened, 2-row version of the Pilot with the same V6 engine. It will be a very capable tow vehicle for smaller molded trailers and would open up a lot more choices.
There are other great choices outside the Honda family as well. The Toyota RAV4 Adventure model has mechanical upgrades giving it a 3500# tow rating. I personally think that's a bit optimistic for a non-turbo 4 cylinder, but it would be perfect for a 13' Scamp. Mazda CX5, Subaru Outback (have to watch tongue weight), and Ford
Escape are other compact crossovers with 2000# or higher tow ratings.