The only numbers you care about are the trailers GVWR, which according to the MFG website is 5388 lbs. and the hitch weight 436.
Then you need to find a TV that has a GCWR high enough to hold the weight of any items you load into the TV plus the weight of the passengers, hitch, and fuel plus the trailers 5388 lbs.
The weight of the passengers, fuel, cargo, hitch and tongue weight of the TT cannot exceed the GVWR of the TV.
The GMC you are considering has a GVWR of 7000 not 5500 the 5500 is the max trailering rear axle pounds.
Here is a good reference site and a calculator to help you figure out what you really need.
Travel Trailer Weight Calculator
Also IMO I would want the 3.73 over the 3.42 if you plan to tow very much or live in a hilly area.