In this below link, if you look at the black line you'll see some different models of mini trailers like Aliner,Little guy, shadow . Depending on your camping style, you might be able to use something smaller if you use campgrounds with showers.
If you use campgrounds with hookups like electric and water, then you won't need a monster battery that weighs 75 lbs on the trailers tongue. You could get by with a much smaller lighter battery. Maybe you can get by with a porta-potty and not a full bathroom or maybe you could get by with an outside kitchen model.
Most of the time, we cook outside, our trailer kitchen doesn't get as much cook time as our outdoor camp stove that we always bring along.
If you really want or need to keep your Nissan "X" you might look at something smaller. RENTING something from a local dealership for a few short trips might be a good idea to actually see how certain units will tow behind your "X" . Then decide if the "X" will work or not.
http://littleguytrailers.com/cs-s/