I travel 4 hours one way when I go stay with my husband near his army post. I have to bring everything I'll need in one load so I can stay for months at a time. We have a baby; her things are bulky, plus my OBDSTAR X300M. We also travel down to Florida every year. So I want the best gas mileage possible for all these long distance hauls. What's the best vehicle for me under $18-20k ?