Just from the numbers this looks like a SRW Ford or Dodge, definitely not a dually nor a GM truck. The front rating means that the front axle weight, when the truck is loaded with fuel, passengers, cargo, and trailer cannot weigh more than that number. Same for the rear axle rating. The final number is the maximum total weight of the truck when loaded.. If you add the front and rear ratings together it does add up to more than the GVW. That difference I assume allows for an unbalanced load, or a very heavy load that, depending on placement, will affect the axle weight ratings.
It is important that you know the actual weights of the truck both unloaded and loaded, and by loaded I mean as you would be travelling with the trailer. A SRW truck doesn't give you much pin weight capacity. My truck ratings are: F-4800, R-8550, and 11,400, with a GCWR of 23,500. I'm below the first three, and slightly over the last (unless the Landmark goes on another diet).