Regarding lithium RV batteries being able to accept large charging currents for fast charging - certain top quality deep cycle AGM lead acid RV batteries are capable of that too, due to their very low internal resistance.
In this link see page 20, the second paragraph down from the top - Lifeline AGM RV batteries are capable of short-term acceptance of 500 amps of charging current per 100 AH of battery capacity:
https://321166-984045-raikfcquaxqncofqfm.stackpathdns.com/wp-content/uploads/2015/12/6-0101F-Lifeline-Technical-Manual-Final-5-06-19.pdf