The limiting factor for a half ton truck will almost always be the payload number, which will be reached before axle load ratings or tow ratings are exceeded.
Many half ton trucks are little more than grocery getters, with P rated tires, highway gear ratios, and soft suspensions. They are fine for occasional trips to the lumber yard or pulling your fishing boat to the lake, but if you make them try to do real truck things like pull big trailers and carry heavy loads, you will be disappointed. Others, like the one in my sig, are more suitable for actual truck use.
A lot depends on your particular truck.