For anything above very low speeds, bicycles turn by leaning the whole frame. The cyclist starts the lean by trying to turn the bars in the opposite direction from the intended turn, in response, the whole bike leans in the opposite direction. Put an experienced cyclist on an off-road trike for the very first time, and his reflexes will be all wrong in turns, and he may crash (speaking from experience here!)

Basically a load on the front wheel just makes it harder to steer at very low speeds