I've been towing various rigs with my two subarus since 01. Trailer brakes start to really make a difference on the subaru at about 1600-1800lbs. Though even then trailr stability under braking conditions really matters more. Light trailers like that dont give you much braking power, but the trailer brakes help stablize a grumpy trailer. Outside temps vs headwinds or a climb watch your running temps! I beat the stuffing outa the old EJ 2.5 ran it 180,000 miles and sold it 100% healthy zero leaks. Currently running the last version of the old EJ in the 2010 OB. Cooling capacity and exhaust porting improvements in 2010 have really helped with the heat shedding.
Keep in mind the prior gen Forester was built for a few yrs on the old legacy platform heavier platform then once again moved to the lighter Impreza platform.
I have really enjoyed the Subarus, the really good and knowedgable subaru community has been really amazing finding the right fixes for things that crop up.