Here's a Fusion forum
discussion on the subject.
Couple of thoughts:
• I towed a 700lb+ TD with a 1500cc Civic without issue. With a lightish trailer and good common sense, I wouldn't hesitate. (It's an '08, so I doubt you're worried about voiding the warrantee...)
• Watching/dealing with tranny temps thru Snoqualmie Pass is the real issue IMO – a trans cooler would be a good investment if it is possible to fit one to that vehicle.
• I am a big fan of professional hitch installs. A large Uhaul center or RV shop will have a floor drill that'll get the job done the right way, in short order. I'm a handy guy – with a lot of tools and experience – and that job is worth paying for for me...