Speed is a factor. Going slower makes it safer (or less bad, depending on your perspective). Only the engineer's who designed it can tell us exactly how much it would improve that situation.
It isn't what you can tow. It's what you can stop. This was a huge risk to yourself but also to anyone else on that road.
Stopping distance is roughly 45% improved by dropping from 70 to 50. (
source) That's the first link I found, other sources likely use other numbers. Its probably a bit different for trailers. But clearly, if your primary concern is stopping distance, going extra slow helps dramatically. If you go to google images and search for "stopping distance vs speed" you'll find countless charts with similar shape.
Weight limits aren't set based upon the maximum weight at the maximum speed?it doesn't work that way. Roads with a limitation of 35mph can have sharper corners, limited sight distances, etc, when compared with a road that has a limit of 55mph. The stopping requirements can equal out because one offers less warning than the other.
Weight limits are based on many variables, including speed.
On some things there are even industry standards on how much you overload things if you slow down.
As an example (from Zieman trailers):
The third critical factor is the speed rating referred to at the beginning of the article. This can be most confusing, since some manufacturers use reduced speed ratings in their literature. The basis of reduced speed ratings comes from tire characteristics. Tire industry standards permit an overload of 9% when speed is limited to 50 MPH, 16% at 40 MPH, 24% at 30 MPH, and so on. However, these criteria CAN NOT be blindly applied to an axle rating. Are the axle, brake, wheel, spring, and other components capable of carrying an increased load? And at what cost in durability?
....
This allows the case by case examinations that reduced speed ratings really deserve.
So there's an industry standard on how much you can safely overload tire, based on how much you slow down... Note that is says it cannot
blindly be applied to trailer axle rates. It does not say it has no application to trailer axle ratings.
Like I said, only the engineers who designed his truck & trailor could tell us how unsafe his situation was. But its silly to act like slowing down and being scared doesn't help mitigate being overloaded.
Another factor with the tires is heat. This time of year, that's a bit less of a concern tool.
I've lost the link, but I recently read an article about the Kansas Highway Patrol meeting with a group of farmers. The HP was talking about how they don't expect the farmers to have scales at the edge of the field to weigh the trailers on the way out. The HP was outright saying that they would not ticket farmers for being overweight as long as it wasn't excessive.
Who's talking about going slightly over the limit? The OP was like 40% over the limit. For the comparison to work, you'd have to ask who's driven 98mph in a 70 zone, and then ask whether that was smart/reasonable.
This discussion is about chewing someone out for driving that was "knowingly" a "selfish," "dangerous," "reckless" act.
If we're going to be consistent, we should also be outraged about other knowingly selfish, dangerous, reckless driving acts. Such as people buy radar detectors for the sole purpose of enabling habitually illegal and dangerous behavior.
Again - I am not saying what he did as good. I'm just saying it wasn't as dangerous as some are suggesting.