Disregard anyone that says "A" half ton will or wont pull anything. There is no such thing as "A" half ton. Thier capabilities run from near zero towing to 10,000 lbs.
You need to know the weight of the load you are towing and the specification for the exact truck you are looking at. Generally you can look the tow rating up online. To do that you will need to know at minimum the engine size. (SIZE not number of cylinders) and rear axle ratio. Usually listed in door as an axel code, again you may have to look it up online.
For instance a 2004 with a 4.6 Liter V8, and 3.31 rear gears will get 20 mpg highway. And can't pull a little red wagon.
A 08 Ford F150, with a 5.4 Liter VB
has over 100 more horsepower, combine that with 4.10 gears and max tow package and I could easily handle my 2 horse aluminum gooseneck loaded to about 6000 lbs.
Also the 1990 ish to 1996 F150's had a 300ci (5.0 iter) straight 6 cylinder in them that are great tow vehicles up to about 5000lbs.