I recently purchased a new 2011 4 x 4 Expediton with the heavy tow package. I was towing my 4000 lbs. trailer and noticed that it doesn't have great pickup. I put the gas to the floor on a flat roadway and still got no noticable acceleration. I am planning a trip to Colorado in a few weeks and will be towing my trailer. I just wanted to know if I should have it checked out or is this something normal. Car has 300 miles on it so it really hasn't been broken in yet. Thanks for any help.