Everyone's suggesting SUVs and trucks...
If you're looking to go old school, the Buick Roadmaster wagon was available with a towing package that made it capable of pulling 5000 lbs.
It's lower and therefore on its own (unladen/not towing) should get good highway MPG where wind resistance is a factor.
Other than that, for fuel efficiency while towing, Diesel is the way to go.
I had a Dodge Ram 2500 Diesel that got 18-20 MPG towing or not. And I have a lead foot.
I never put it a full capacity, but it didn't seem to notice a 1500 lb tandem axle with 2500 lbs of car on it and another several hundred pounds of car parts in the bed.
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