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I installed Air Lift 1000 air spring helpers (model 60904) for my rear coil springs. They help limit squatting of the rear when carrying heavy loads and I also like them for stiffening up the rear when I tow my small cargo trailer. And I guess my Curt trailer hitch is another "best" thing I've added to the car.
Here's a picture of the Curt hitch for comparison. It's less wide from side to side than the Draw-Tite (not saying either is better ) and has a "Tee" configuration with a mount that goes under the spare tire pan. I thought that feature might make it better able to handle trailer tongue loads.