If you’ve got a more current RV with a 3 stage converter in it then check electrolyte levels if non sealed battery and top off with distilled water
Plug the RV in and let the converter do the work... Most newer rigs have a WFCO 3 stage and sme have a PD 4 stage... either will do the job
You could also just buy a battery tender and connect it and it will suffice with 2 12 volts in parallel or 2 six c9lts in series
Even Trojan website if you read down thru their doc states 3 stage charger is just fine...
https://www.trojanbattery.com/tech-support/battery-maintenance/
