My Outback has some squeaking coming from the rear end. The car is way too new (2014) to need shocks, but that is exactly what is sounds like. One side note, I drove it through the city at a very high rate of speed (family member emergency, long story) and was wondering if I could have damaged them in just one trip? The total drive time was probably 20 or 30 minutes / 5 miles, but the city roads contain plenty of potholes, etc.
The car isn’t exhibiting any other symptoms, alignment is fine, etc.
The only other thought I had was the storage compartment around the spare. I actually removed everything and drove it around for a bit and still got the same thing.