My previous LC Prado (same model) was equipped with Bridgestone Dueler Sport, which allows me to make the comparison with the Dunlop Grandtrek AT20.
On dry roads, with Dunlop Grandtrek, braking distances are increased and handling worse (slide of 4 tires when cornering).
But on wet roads, it's a disaster. When cornering - even at a slow pace - the car slides and you have to drastically slow down to keep it on track. And when braking, it's even worse. The car skids, slides and only slows down a bit - but it’s like the car doesn’t want to stop or to keep on track. This tire is really bad, dangerous especially in the wet.
And, having raced on ATV for many years, I‘m supposed to know how to keep my car on the road!