Used to read a lot in Royal Road, got bored from the clichéd LitRPG, though I was surprised to find Dungeon Crawler a royal road story in every bookstore. I still follow one story from Royal Road though.

Anyway whenever I travel and want to read a royal road story I simply download the chapters. You can convert them to an epub.

https://redlib.catsarch.com//r/litrpg/comments/xrhawo/ereaders_and_royal_road/