Holy thread resurrection!
This is like a zombie, it keeps coming back to life.
Not sure what the most recent poster is complaining about - it's pretty clear on the Subie documentation what its towing capacity and limitations are. If they aren't good enough, buy another vehicle or a different trailer.
And, as far as the claim of "If drive more than 5 miles up hill and it's hot outside your screwed and you warranty is void": read the owner's manual closely. It says that "damaged caused by towing is not covered under warranty". It doesn't specify OEM, aftermarket, hot, cold, or hills. Damage caused by towing is not covered.
That poster says he (she?) has an 1850 lb tent trailer and a 3.6 Touring (not sure about the year).
The '17 book says (for CVT):
When towing a trailer on a long uphill grade continuously for over 5 miles (8 km) with an outside temperature of 104F (40C) or above, the max trailer wt is 1500 lb.
Below those limits, you are back to the normal 1000 unbraked and 2700 lb braked.