depends on how big your tires are or how hard you wheel.
ive run stockers that ive checked yearly
now i run big tires on relatively small axles so i check them monthly(or anytime im wrenching under there really just cuz..)
i feel there is a basic maintenance if you wheel your jeep regularly and im always tinkering when it comes to these things like trackbar tighness, jam nuts coming loose off my currie ca's, retourqing things like lugs and such
MY RIG: http://i78.photobucket.com/albums/j87/ramburger/a0fcb769-5e55-4a62-8426-cb7cce41c0c2_zpsccea3c78.jpg