24/7 oxygen - how to continue travel and enjoying life

Hello friends! After being diagnosed with stage 4 lung cancer with mets to bone, I have experienced a collapsed and trapped lung which has created a requirement for 24/7 oxygen supplementation at 2LPM.
I have a ROVE6 that I can wear in a backpack and it is very helpful.
My concerns seem to mainly revolve around being afraid I will put myself in a situation that I won’t be able to handle!
Can anyone with experience in this situation share if you have traveled, say by train, car or air with a home oxygen concentrator? Or if you have solely depended on a portable, or brought along air tanks?
Many thanks in advance! Good luck, hugs, and prayers to all who are affected by this dastardly disease!