Lets put it this way...the Stealerships look for ANY excuse to get paid for repairs/not honor your warranty.
Some are more honest than others, and we have some mechanics, etc on this site that work at said stealerships that I would trust...but the great majority of them that I've been in contact with, including the Stealership my X came from, look to screw you.
My dealer said if I put a different brand of tire on it or went off road, it would void my warranty.
I called BS, and, the LAW stipulates that they CANNOT void your warranty because of a mod, merely refuse to repair the mod, or something they they can PROVE failed due to the mod.
So - As the Shackle for example will not likely cause your windows to fail, they are shit out of luck trying to make their "Your warranty is VOID" claims stick....THEY ARE LYING TO YOU.

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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif