I remove and clean the backside of my wheels every 10k miles (wheel cleaner, WD-40, Goo Gone and Simple Green or Fast Orange). Dirt, grime and tarballs will eventually effect wheel balance.
While they are removed I hit the axle nuts, shock/strut shaft top nuts and all the hub/suspension fasteners with a good rust preventitive, white grease the hub shoulder, light lube the lug bolts and clean/seal all the plastic/rubber panels/parts I can get at (airbags included). When the time comes for disassembly everything goes MUCH smoother if you do this.
Over 10 years and 170k miles and still running OE bags , but when they go I have a set of KW Variant 3s going on.
And thus will end the days of tow duty for the X.