06 NBS Tahoe 2WD maintenance questions

[BealT1]

So I just bought an 06 Tahoe LT 2WD with 90k miles. Was a 1 owner, very well taken care of and has a full carfax of maintenance done at the dealer it was purchased from. I really want to get the most out of it and wanted to see if anyone had some tips for scheduled maintenance. What all is needed or should I be worried about anything as I come up on the 100k mark? I see so many with over 200k and I want to make sure mine makes it there too. Here are a few fluids I was wondering when I needed to flush/change them. I will be driving from Florida to Arizona and back in a few months and wanted to make sure everything is good.

-coolant flush
-transmission fluid w/ filter
-differential fluid

Any other tips or advice would be appreciated!