We have taken several long trips lately and i have been noticing that at high speeds the expedition feels rally loose. Any sudden wind burst and i feel the expedition move really easy. If i pass a semi truck. I can feel the sudden burst of air as soon as i clear it. If i hit a small bump on the highway. I feel like i am going to fish tail out of control. Is it just the od the expedition thays causing this? Or is tjere something wrong?