Happy medium between comfort and good gas mileage to haul?

Pretty much regardless of what you buy, you'll get ABOUT the same gas mileage while towing (it's the aerodynamics of trailers - they're lousy). For instance, I get 11 mpg while towing, which is about the same that a pickup would get towing the same trailer. However - I get much better gas mileage when NOT towing.

Consider what you need in order to pull the trailer you want (weight, length, wheelbase, tongue weight, etc), and what the gas mileage of the TV is while not towing. Towing, it'll be lousy regardless.