I have Air Lift automatic leveling kits in two of my vehicles and had one on a previous car too. I wouldn't tow without it, I think it is great. The kit I use has two air bags for the rear, a small compressor, a solenoid release valve, and a sensor/controller that senses the height of the rear suspension. If it is too low for about 10 seconds, the compressor runs lifting the rear. If it is too high, the solenoid opens lowering the rear. I tow a full size car trailer, utility trailer, all kinds of loads in the car, and of coarse, the 560. The Air Lift compensates for everything, keeping the hitch height within about an inch no matter the load.
Installation of the kit is a bit of a pain; if you are not handy in the garage you will want to get a shop to install it. It is not really difficult, but requires some big tools and several hours as well as some mechanical and electrical experience.
Addendum: I looked at the Air Lift
website for your car and it seems they don't make the kit I have for your car though they do have several options that would work. In fact it seems they have discontinued the automatic leveling version of their controller (rats!). There may be other suppliers that can do an automatic control system, but the manual version may work fine for you, just a bit of fiddling every time you hitch and unhitch.
