Have done some searching already. This is just a feeler post. I am considering in the future purchasing a trailer and towing it home, problem is trailer is in Washington state and I'd be towing it back to Pennsylvania. It also weighs about 2200lbs. Is it practical to tow it with the Prius or would I be better renting a truck to bring it home? I'm already aware that it's not designed to tow.
No way i would tow a 2200lbs trailer. Assuming the tongue weight will be 15-20% of the trailer weight, your empty trailer alone with 2 passengers in the prius would exceed the 800lbs payload of the prius. It's your car, so do what you want. I would advise against it. If you are talking a light 400lbs utility trailer, then i'd say ok depending on how much stuff you put in it, but not what you're talking about.
Please Don't. Your Prius might be able to pull a 2200# load, but stopping and turning is pretty important too, and there are a lot of bumps between WA and PA, not to mention other people on the road. Your Prius was designed with a MGVW in mind. Engineers try to 'solve for Darwin' when they design stuff, but I think that this might be pushing things a little......(*) or in this case pulling. Good Luck!!!