Environment for working is something I research before traveling (making sure there's ethernet in the hotel room or finding a spot beforehand where I can take scheduled calls).

I guess I'm really more concerned about the screen setup. Are there any foldable or portable monitors (~13") that work well when traveling?

Anyone ever tried using an Android tablet as a second screen for desktop?

Added: The personal router is a good idea, but usually just tether my Android to my MacBook if I need to supply my own data.