2005 Ford Explorer Sport Trac XLS Rwd 4dr Crew Cab (4.0L 6cyl 5A)
It's been one of the best vehicles I have ever owned, I bought it just before the gas prices went through the roof. Still not too bad on fuel consumption. On the highway I'm averaging 21-22 mpg. Great little truck.
Roll down back window, 12 volt tap in bed.
Maybe configure it for a Hybrid? Or alternate fuels?