The best towing car/truck I ever owned was a Ford 150 with the I6 300 in it. Slow, but gobs of torque that would rival most diesels today. The pistons were the size of softballs.
I came to this forum specifically for researching the V8 4R. Part of my requirement is to find something suitable to tow my track car a few times a year but not a full-sized truck. I understand the bigger is better approach, but it's overkill for my needs.
That and the ability keep it between the lines. A V8 4Runner may be able to move the trailer, and you may be able to stop with the help of trailer brakes. But get a wobble/shimmy started by a sudden gust of wind while pulling a wildly overweight trailer with bad load distribution down the interstate at 80MPH; neither your V8 nor the brakes mean squat when that trailer starts tossing your 4Runner around like a toy.The art of towing is not going, It's about stopping. I routinely pull 6-9k pounds with my 99.5 Silverado 1500 5.4 4x4. Having a trailer with breaks is a game changer. And the main thing is no matter what you are towing with. IT NOT A RACE! Sure with my routine load some hills are in the 1-2nd gear range. I do not use tow/haul. I actually shift it manually to lock out my gears the best I can.
That and the ability keep it between the lines. A V8 4Runner may be able to move the trailer, and you may be able to stop with the help of trailer brakes. But get a wobble/shimmy started by a sudden gust of wind while pulling a wildly overweight trailer with bad load distribution down the interstate at 80MPH; neither your V8 nor the brakes mean squat when that trailer starts tossing your 4Runner around like a toy.
The worse the trailer/tractor weight ratio, the slower you have to go. Seriously... if you need to tow real weights, even only once or twice a year, get a rig capable of handling the job. It may be overkill the rest of the year, but at least it won't kill you.
Manufacturers today inflate the numbers to make themselves look better on paper and for social media, because one knows bigger is better. It is hard to say how good one car/truck tows vs another until one actually tows in said vehicle.
It's worth noting for anyone reading this thread that this is thankfully no longer the case. It was true for decades, but now the standard tow requirements that all manufacturers have agreed to are very tough. They don't just include tongue weight and braking, but also acceleration, cooling, and stability. Tow ratings on new trucks are very conservative and new features like trailer stability control and integrated trailer brakes add a lot of safety margin.
You still need to respect the fact that you are towing and pay attention to the various load limits, but you are by no means pushing the safety of a new truck by towing near the maximum.