Welcome to the forum.
Like you, we previously had both tents and also popup trailers. We now
have a 2014 Scamp
13ft with the new 54" bed. For pictures see:
Just a couple of questions for you to consider:
How many people do you want to sleep? (Adults only? Kids/grandkids?)
Does your Outback have a manual transmission or a transmission cooler
on the automatic transmission?
How far do you plan to travel?
What kind of facilities (bathrooms/showers, electric, water, sewer)
might be at your planned destinations?
Besides the "Trailer Weights in the Real World: thread, you might
look at a couple of other recent threads:
If you are careful about the tongue weight, a 16ft Scamp
within the Outback's capabilities. However, I wonder if you might find
it to be a more agreeable towing experience to tow something that
actually weighs much less than the Outback's rated towing capacity?
Scamp Lightweight Travel Trailers & Small Campers - Scamp Trailers
Many choices will be influenced by your own camping style and
personal wants and needs (see questions above.) All considered, I
suspect that one of the many lightweight fiberglass
and sizes might truly be your best option? But that's just my guess ....
I think that you will find lots of information and friendly, helpful people
on the forum.
Good luck with your decision!