You have come to the right place. There are a number of vintage and newer molded fiberglass trailers that can be towed by a Subaru Outback. Most are around 13' long (tongue to bumper) with 10' cabins. We own a front bunk (no bath) model, which served our family of four well.
Bathrooms are pretty rare in the smallest 13' models. Scamps are the most common , but you can also find Casita
Patriots and the occasional Trillium
1300 with a front wet bath. I think Canadian-made Armadillo
makes a small front bath model, but I'm not sure. They are new and upscale.
offers one feature none of the others do, and that's the option of a wider main dinette bed (54" versus the class-standard 45"). All deluxe (wood interior) models have it, but only some newer standard (fiberglass interior) models do. For two adults on a longer trip, I'd want the extra space for a comfortable night's sleep.
Pro-lite is not made using the same molding process as the true "egg" trailers on this this forum, so you won't find a lot of information here. Helio is another Canadian "not-quite-molded" option that might fit the bill for your needs.
Best wishes in your search!