IMO, with a "half ton" pickup, which yours qualifies as I believe, the KEY number you need to work with is the pay load of your pickup.
You can find out exactly what that number is by looking at the yellow sticker in the door jam of your pickup.
IMO, this number will limit your trailer size faster than any other number you have.
You will need to subtract Your weight, and weight of all other passengers. Weight of any after market add ons to the truck, such as bed covers, etc. Weight of the hitch you are going to use. Depending on the hitch, these can fairly heavy.
Then you need to substract the estimated tongue weight you will have. I know you like to use the dry weight numbers. I'm the opposite. I would always use the gvwr numbers.
The reason I do is peace of mind for me. I do make the assumption I will not ever exceed the gvwr, but it is why I weight the TT before a big trip to make sure I haven't exceeded the gvwr of the trailer.
But going back to the TV's cargo capacity, I would substract 15% of the GVWR from the cargo capacity. This will let me know how much more stuff I can put in the pickup bed.
I have a trailer who's gvwr is 4950#. I have a F150 4x4 supercab with 5.4 V8 and tow package. With the TT loaded, plus me and DW, and the stuff I was taking with me, I ran out of cargo capacity on the pickup, even though in theory, I had the tow capacity to pull a much larger trailer.