I have an 07 4wd with off road package 87k miles. The steering has gotten loose and is just a pain to drive requiring constant correction. I've taken it to Nissan and they replaced the struts and aligned. No improvement. New tires, no help. Went to a private alignment shop and they said everything was tight and alignment within spec. I replaced the rack bushings and that actually seemed to help a little (maybe placebo effect). It clunks on bumps so wondering if control arm bushings may be shot due to age. Any ideas?