Where are the usual rust spots 4 suburbans?

[bcfishon]

So I scored this awesome suburban the other day and was thinking about flipping it untill I drove it,I simply love it and now I contemplating keeping it. I am well versed in trucks and a little experience with the Blazers but this is my first suburban and the rust is showing up differently than what I'm used to. The rockers seem to be rotting from the outside in rather than the usually door sill area. I also noticed rust starting at the inside roof top where it meets the windshield and behind the rear seat where the front bed wall meets the flooring. Pretty obvious why the rear quarters are starting to rust at the inside floor level. Are there other areas that are typically problem spots for rust that I need to look for on this particular body style?.