How fast you can go is not nearly as important as how fast you can stop.
Tire failure is probably the smallest percentage of the reasons for accidents. Impaired or just plain over driving your stopping skills has to rank higher.
It is also in the math, twice the speed means four times the amount of energy that needs to be transferred to the pavement to stop. Hopefully it is transferred through the tires and not the mangled wreckage of the tow vehicle and trailer sliding down the road.
In my experience, when you have to stop fast, a lot of pavement goes by before you and your TT have come to a stop.