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The dynamic mode lowers the car, therefore the tow ball height. I have a T8, my "Comfort" mode is called "Hybrid". After a long journey on Hybrid most of the time, when turning the car off, it lowers the rear. This means it was lifted during the ride. With Power (my equivalent of Dynamic) the car lowers at the start of the journey and it stays like that until the end.

When I tow, I use the individual driving mode. I set all the features as Hybrid (Comfort) except the suspension and steering which I switch to Power (Dynamic). This way I use the optimum amount of fuel and I even tow full electric at low speeds in camp grounds and storage area.

L.E. When the rear is lifted, the tow ball height is above the european standards on most of the SPA Volvos