I agree with Stuart,
I hooked our 18' dual axle flat trailer, about 3,000 lb to my 52 1 ton. I had my disk brakes then, so no problem there, but the go part was a problem. The trailer was empty and I could hardly get to 4th gear on level ground with my 235 and 4.56 gears. Your 1/2 ton will wimp out even sooner with it's faster gears, and if you have an originalish engine and a 3 speed I wish you luck with anything over about 1500 lb for any distance.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-