I do have a Subaru. 2012 3.6R Outback.
I tow a 2200 lb utility trailer and even did Monarch Pass in Colorado. They do not come much more difficult than that for a major highway. There were no problems with power. Pulled the pass at the posted speed limits.
I do have electric brakes on the trailer as you should have when towing with a car regardless of the make.
I installed my own 7 way connector and am using the factory hitch and a Prodigy brake controller.
I did install an auxillary transmission cooler for the 5EAT transmission.
I have a s
ScanGauge II that I use to watch my engine temperatures and transmission temperatures. Also watch the same temperatures with my diesel pickup when towing.

