thebrakeman, thanks. I saw a mountaineer with v8 and an explorer with 4.0 v6 and 3.73 gears, both newer I think 07-08 at carmax. What do you think about those options. My Casitas is a 17' liberty deluxe. dry weight is 2950, loaded and half a tank of water its 3200. tongue weight guess is 400lbs...