Ok Me and the wife are trading in the Rice burnin SUV for a Suburban. Finally she is listening to me (Women!!) Anyways we are looking for a 97 and up what are some things we should look for in these models as good and bad. O yea and what does barn doors mean and whats the big deal with that? O yea were looking for the 4x4 model what kind of gas difference is there between the 2wheel and 4wheel. We get around 20-25 now with the Xterra will there be a big difference? Thanks in advance for the advice.