I pulled a 4 horse older steel trailer GN behind a 3/4 ton diesel for a few years and "never had a problem." Growing up we had a dually as well as an RV. So I have experience with all sorts.

However, to FH's point, it isn't the pulling part, it is the stopping point and I don't care how great your trailer brakes are.  You need your truck to help in a bad situation.  I live in Dallas and there are some serious idiots out there.  I haven't needed to but I want to KNOW I can stop hard if I have to.

We upgraded to a 1 ton dually three years ago and I remembered why dually's should be pulling bigger/longer horse trailers.  The stability, control, etc are such a big difference with a bigger truck.  If you are hauling anything big or long, you need to have a bigger truck. I wouldn't hesitate to go to a 450 if I had the need.

And I much prefer my diesel.  The DEF crap is stupid but other than that, I am a diesel truck all the way girl.

I haul with my 2018 Ram 2500 diesel.  Absolutely love the truck and have zero problems pulling or stopping with a full trailer.