I think most of the post are assuming rather than pulled the same weight side by side with both,a modern HD 150 and modern 2500 HD.
Heavier trailers maybe but not sub 8k. As far as power goes, the same engine in a 1500 will be more powerful than in a 2500 because of the weight difference.
I regularly pull a 8k trailer with a 2008 F-150/5.4 and a 2003 Chevy HD-2500/6.0 and there isn't much of any difference.I also pull a 10K loaded firewood trailer with both without a WD hitch and again, not much difference except the F-150 has a beefed up rear.
I've always owned 3/4 ton or bigger but these new 1/2 tons have taken the place of the older 3/4 tons and are more than capable of hauling 8k trailers around and with a better ride not towing on with better mpg.
This is coming from a 3/4 ton or larger guy for over 40 years of hauling stuff around and one that had to have motors like the mighty 454 big block.. Times have changed big time.