As I stated in an earlier post, I am looking at an '06 Sierra 1500 SLE extended cab 4x4 Z71. I am trying to research similar trucks online to find out what options were available for 2006 (read: build a used truck as if I were buying it new). Does anyone know of a good website to do this? Also, where is a good site to decode the options (and differences between such options) for 2006 GMC trucks such as SLT, SLE1, SLE2, HD, Z71, etc. I haven't bought the truck yet so I don't have the RPO or build sheet. Only the VIN. Thanks for the help.
