It is so true! When you are outsized by your opponent (which for someone like me happens 80% of the time), you are really forced to develop good defense and rely much more on a sense of timing and how to sneakily get the grips or hooks you need in order to get some control. One thing I find very useful when trapped in bottom positions is to take a moment to realize where the pressure from my opponent isn't being applied, and then move there!

Also, you probably already know this, but if you can't train, doing solo drills is always a great help to keep your skills sharp and your body conditioned, and most of the time you don't need a lot of space. I mean stuff like this:

Enjoy your trip!