Pretty close to the max OP... I had an F150 and it was at its max. With my DW and the two growing boys in the truck I was maxed out on my axle weights. It pulled ok, handled the trailer ok. If you are a stickler for numbers ...(which you are since you ran this by a forum).. eventually you will upgrade trucks to deal with this issue of half ton payload (or lack thereof).
Will it pull it? Yes... Will it pull the trailer safely? THAT question is entirely reliant upon you. The truck can physically do it. Do your part and you can be safe. (This advise really applies to all combos, not just half tons.
Thanks!
Jeremiah