My 2003 Fleetwood is in need of new batteries.  It has 2 12 volt batteries and 4 6 volt batteries.  Prior batteries were Interstate but can't find a size to replace with, but think existing ones are past their prime, probably at least 6 years old.  Brought the RV in 2023, and  no records of replacement.  Any suggestions, brand, etc.  Don't want to break the bank, but want quality batteries.  Thanks, Joe.  

If you're planning to keep your coach for at least three years, I would highly recommend replacing your coach batteries with lithium.  Prices have come down significantly, they are lighter than lead-acid batteries, last MUCH longer and require no maintenance.  But you need to do your homework or get them replaced by professionals.  I switched mine over myself last year, but it was quite a project.  You will need to decide on what size (both physical size and power), how to wire them (LiPO4 only come in 12V) and secure them and you will likely need a new inverter controller.  Bought Vatrer batteries and so far they've been great.  As for your chassis batteries, AGM is the way to go.