Yes, GCWR is total weight on the road
Rangers came in regular cab, front seats against the rear of cab, or extend(super) cabs that have storage behind the front seats inside the cab, also can have jump seats behind front seats
XLT is a trim level, has most options usually, but not specific to supercabs
Found 2003 Ranger Brochure here:
https://www.therangerstation.com/resources/pdf_documents/2003_ford_ranger_brochure.pdf
It has towing info on last page
Regular cab "curb weight"(no driver, no gas in the tank) is 3,100lbs
Extended cab curb weight is 3,400lbs
4x4 adds 200lbs to either
If you have a supercab 4x4 that would mean a curb weight of 3,600lbs
Driver and full tank of gas, add 350lbs, gas = 150lbs
So you are at about 4,000lbs for the Ranger total weight with driver and fuel
Leaving 3,000lbs for trailer and load, to be at or under 7,000lbs GCWR
But if you have a passenger and any cargo in the cab or bed you need to include that in Ranger total weight