I just installed two GoPower 250ah batteries in my 22 10-2.
If NL one have the appetite to modernize there’s a great area under the closet (where the current batteries are) for the following:
500ah lithium batteries
60a MPPT solar charger controller
…and perhaps even as much as 750ah.
On my previous 2017 10-2 I installed two 100ah lithium batteries under the center step. Worked great but wiring was a PITA.