We have a 2009 AWD SXT with the trailer tow prep package. As such, with the proper hitch, our vehicle has a tow capacity of 3500 lbs.
We arranged through our local Dodge dealer to have a hitch installed as we'd heard that hitches would require part of the fascia/bumper being cut out, so we wanted our dealer to do this so it wouldn't void our warranty. They didn't seem too familiar with installed hitches and wiring, so I asked them to show me what they'd ordered in before they installed it.
The hitch receiver was fine, but the draw bar (I think that's what it's called) was stamped with a maximum load capacity of only 2000 lbs, so if they'd installed what they'd ordered in, we wouldn't have been able to tow our tent trailer/pop up.
They ended up sending the Journey to a local trailer/RV place to have a hitch installed. While the Dodge dealership can only order in and install parts in their catalogues, the trailer place could choose from many hitches to install on our vehicle - WITHOUT HAVING TO CUT OUT THE BUMPER! It's a Class III and can handle a lot more weight than we can actually tow, so it's a nice safe option. The receiver sticks out a bit, but I like that it didn't involve cutting anything out to install.
If you're at all handy with cars, I've heard from many people on other forums (camping forums for pop-up/trailer owners) that installing hitches isn't that big a deal if you have the tools. A lot of people I know have bought from e-trailer with great success. Bear in mind you'll also need to hook up the wiring or modify it if you are towing anything, so it's not just installing the hitch that you need to deal with.
I think we got the Class III hitch, draw bar, 2" ball and 7-pin wiring done for about $500 CDN, so it should be less in the US.
If you want to, you can check out this site for hitches for the journey.
http://www.etrailer.com/hitch-2009_Dodge_Journey.htm
We have the Drawtite hitch on our Journey now.
Hope this helps.
Julie