C rating is a way to describe how much voltage drop and heat a battery will suffer.
This example is opposite of RV batteries, but might help to understand. Some of those radio control drones use a tiny little 1amp battery with a 100c discharge rate. That means you can pull 100amps of burst power out of that super small little 1amp battery.
There will also be a recommended charge C rating. Lets say the battery has a 5c max charge rate. For a 1amp battery you would want to limit charge to 5a or less.
For your RV the math looks a bit differnt. Since your batteries are 100s of amps and it appears the charge C rating is a fraction like you posted. 0.01C rating for a 100a battery would be 1amp.
Often the discharge C rating is much higher than the charging C rating.