What's the longest/heaviest you would tow with a 1/2 ton?

I have towed my trailer with a half ton, three-quarter ton, one ton, and one ton dually. Gas and Diesel. There is a difference.

To me, it depends on how far, and how often. And the purpose of travel. My trailer was intended for campgrounds (within 300-400 miles) with my daughters. If I was traveling across the US, and not staying in one spot often, I would want a smaller trailer. If I was traveling across the US, or thought I would be, I would be going bigger than half ton.