The GVWR (Gross Vehicle Weight Rating) says that you should NEVER exceed this Gross trailer weight including what you put in it, including; food, clothing, water and sewage and such.
If you are going to travel in mountains and deserts and pretty much anywhere in the USA, most experts recommend that you never exceed 80% of your maximum ratings. This would mean you should not tow more than 80% of 5200 or around 4200 lbs.
At the same time, you should get your Traverse's; engine, cooling, transmission, braking, and overall drivetrain systems into top condition. Pulling loads up and down mountains and across deserts can really stress these systems over time.
Anyway, your trailer looks to be right up there, but actually under the limits of your Traverse.