Deep breath please. One of the important components of the manufactures tow rating of a vehicle is now how much a vehicle can pull, but how much it can stop safely. The key word is "safely". With this in mind, trying buying brakes for a RAV-4 with a 4 cyl and then with a V-6. They are not the same parts. That is one, (and only one) of the factors used to determine tow ratings.
Now granted the manufactures will error to the side of caution in establishing their tow ratings (so they don't get hauled into court every time there is an accident) but they have teams of engineers to calculate these ratings based on vehicle size and weight, engine size, frame strength, stopping capabilities, cooling capacity, transmission rating, etc, etc, etc and the capabilities of “Joe Average”.
Now if someone wants to exceed these recommended tow ratings, then that is their call. But in so doing they are assuming any risks that come from their actions. If they are in an accident and it can be proven that they are operating a vehicle outside the manufactures recommendations, and it contributed to the cause of the accident or the resulting damages, then they could be held responsible for their actions and damages in a court of law.
To advise someone else to ignore the manufactures recommendations and not warn them of the risk they are taking on is a little callous in my opinion. I’m not saying don’t tow over the limit (but personally I never will), just that the person towing should be aware that there will be issues they need to be aware of. Such as, loss of fuel economy, longer stopping distances, increased wear and tear on the vehicle, possible voiding of warranty, increased risk to others in an accident, and so on. But if one is willing to accept these risks, then go for it. I just hope we don’t travel the same road.
Redick & Peggy + 1 dog & 1 cat
2007 DSDP 4035
99 Yamaha Royal Star & 13 F150 SCAB