Agreed--this TBN forum has a wealth of info on trucks and towing, but for a newby like me, it's a job to sort out the facts from the opinion when making buying decisions.
For example, I need to tow my parade tractors (one at a time), which weigh up to 4500 lb. The towing will amount to less than 4000 miles per year. After looking at 1T diesels and 20ft GN trailers, I'm pretty much going with a 3/4T gasser and an 18ft bumper pull car hauler. Lately I've been interested in the F250 with the 3-valve/cyl, 8 cyl 5.4L Triton gasser. I know many folks think the 5.4L is a puny engine for serious towing. So I tried to educate myself on that score.
I found the torque power curves for the stock 3V 5.4L
View attachment 159448
and for the much prized 1998.5 24V Cummins 5.9L turbo diesel (stock). Cummins, of course, is by far the preferred diesel engine for 3/4 and 1T PUs and the 24V enjoys an impressive reputation.
View attachment 159449
Diesels are touted for their low end torque (the grunt in towing), so I looked that these two engines at 2000 rpm. Interestingly, the hp and torque numbers are nearly the same
130 hp and 350 lb-ft for the Ford 5.4L
and
130 hp and 360 lb-ft for the Cummins 5.9L
Remember, that the Triton is a normally-aspirated, fuel injected engine while the Cummins uses a turbo to get its numbers.
Sure, the Cummins gets better fuel mileage and you can tune that engine to nearly double the hp and torque. And the resale value is better for the diesel, yadda, yadda, yadda.
But I'm only interested in doing a pretty simple towing job and can't justify the extra $5-6K for the Cummins and I'm not interested in performance enhancements. Stock engines will do my job fine.
Moral of this story: you need to do some legwork to get to the bottom of things.