Redsky wrote:
A Subaru wagon will pull a 3,000 lb. trailer and without the trailer it will get 30 MPG on the freeway.
Dunno which "wagon" you're referring to, but I doubt that any Subaru except possibly the Tribeca is capable of towing 3,000 pounds of travel trailer. Limiting factor is tongue weight- limited to 200 pounds on just about every model. You can't tow a 3,000 pound TT safely with such a low tongue-to trailer ratio. The "high" number really only applies to boat towing- due to differences in design those can be towed with a 5-7% ratio.
Again excepting the Tribeca, Subaru max tow limits are between 2,000 and 2700 pounds...And let's keep in mind that the weight of everything in the car except a 175 pound driver has to be taken off that number in order to stay under max GCWR.