What comes with the z71 and z66 Chevrolet Avalanche models?

As it was explained to me the z66 is a better road suspension to give the riders a more comfortable ride on the streets. The z71 is the 4wd suspension a little bit stiffer to handle the bouncing from off road adventures. With the z71 you also get the skid plates the tow package is on all the packages of the avalanche. Watch out for fakes Avalanches with the sticker but not the options look in the glove box for the build codes a little white sticker with a bunch of 3 digit codes if z66 or z71 is not on that sticker then its a fake.