There are other things to consider when pulling heavy loads other than the engine, not to say that's unimportant.
As a rule the brakes of 1/2 ton trucks are smaller than 3/4 ton trucks, and that can be very important.
There are other differences also which should be considered.
Yes you will see and hear lots of people talk about hauling heavy trailers with 1/2 ton trucks.
At some point, the trailer might be driving the truck also.
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