Weight on the receiver has little to nothing to do with the truck.
You will want to identify the hitch by scrolling through pictures. Use any search engine except google and click on the "images" at the top to get pictures rather than web links. Match your hitch up. Then search for info on it. This will get you close at least.
Usually trucks will have a class 3 hitch from the factory/dealer. Those are around 500lbs as stated for tongue weight. I doubt it would be over 1,000lbs for a class III Total trailer weight will be in the 5,000 lb range likely.
You can load way more than rated on the hitch, then it will start to crack. Hopefully slowly and over many, many thousands of miles the crack will enlargen. Keep an eye, particularly towards the back, where the hitch bends 90 degrees to mate up to the truck frame, this is a weak spot due to the bend.
You would really have to go way over the max load to cause a catastrophic failure, mostly it will crack and give you time to find it. Mostly, but dont be the one.
No one is advocating overloading a hitch, and this will prompt many, many Captain Obvious' to let you know the obvious that you already know which is so obvious, but some struggle with the obvious even, so get excited when they realize the obvious and have to share the obvious. The obvious is, dont overload your hitch. But read below for more obvious post pointing out the obvious. lol.