Depending on what exactly you are towing, "tow capacity" may be the least important thing you need to know.
There are several specifications used for towing.
You shouldn't exceed any of them, although in reality some people do.
Probably one of the more important ones is your trucks Payload capacity.
Inside your drives door, you will find a sticker that lists what the payload of your exact truck is.
It will look like this:
View attachment 984360
placard for towing capacities.
See the statement "Combined weight of occupants and cargo should never exceed: 682 kg or 1505 lbs.
The sticker is just an example. The sticker in your truck will likely list something different.
When towing with a 1/2 ton truck, you will almost always exceed that payload before you reach any published towing capacity.
There is towing capacity
Payload capacity
Axel capacity
Tire load capacity
Exceed any one of those, and you will not have a very pleasant towing experience.