An extended van will definitely have more overhang to deal with on ascending angles. It might be fun to tow with it to get a comparison between the two vehicles. I knew that I needed more vehicle when I came around a curve once and suddenly there was a completely stopped wall of traffic in every lane. I had an E150 with the T2970 and it had taken everything I had to stop about three feet behind the vehicle in front of me. I have the E350 for its suspension, brakes, and it's large engine was about 1.6mpg better than the 5.4L I had in the 150.
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