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Make sure you are charging your house and chassis batteries long enough to fully charge them before your trip. I'm not positive about your RV but I was told that shore power only charges the house batteries in most RVs. And not the chassis batteries. The alternator charges the chassis (cranking) batteries but, if your batteries are low when you leave for a trip. If your trip is short or if you stop multiple times for fuel. Groceries. Bio breaks. Driver changes etc then you might not be fully charging the chassis batteries before draining them down by cranking the coach again. A small automatic battery charger from harbor freight tools for about $30 works ok but takes a while to charge weak batteries before your trip. There are more expensive larger ones and better brands with higher Amp output. Just make sure they are automatic and adjust the amps based on the level of charge.. One I have says it will chsrge at 15 amps but it seem like it never actually puts out 15 amps. However I like it because it shows the battery voltage and % charge while charging. But it takes a long time to charge. So I use 2 or 3 chargers at the same time on different batteries. For pre-trip charging. I prefer to charge each battery separately by disconnecting the positive terminal from one of the 2 house batteries. Because my charger is 12 volt I leave the 2 house batteries in series to charge them. Before replacing batteries or if batteries are not staying charged some auto stores will check your alternator free to verify it is charging. Just make sure you check the parking lot to make sure you can get in and out. Some of the auto stores have small parking lots that are not suitable for an RV.
Also if your batteries are fully charges they can be load tested to check how strong the battery is.. Before charging, clean your battery terminals and clamps if you haven't done that recently. Sometimes a loose or dirty/ corroded connection can prevent charging while driving. If you really need new batteries then the ones mentioned are good but consider the cost, the warranty and expected life vs the same for cheaper batteries. I prefer to go with a 1yr or 3yr warranty battery for $100 to $150 each. I figure I'll probably get 4 yrs and as long as I get more than 2 yrs per set of cheaper batteries then I'm probably saving money because the $400 battery would need to last 8 yrs to be the same cost as a $100 battery that last 2 yrs. So if I can get 3 or 4 yrs from the cheaper battery the long term cost is less. Costco has some large 1 yr and 3 yr warranty batteries for $100 to $150. I'd rather put those in particularly if I'm planning to sell the coach in the next 12 months. I doubt having 2 $400 ,batteries is going to get me any more money when I sell than having 2 relatively new $100 batteries. Might be different if you have a $400k plus coach. Now my logic assumes you are changing batteries yourself. If you don't do your own maintenance then you might want to go with the higher end batteries that have a better chance of lasting longer. I also look for batteries I can maintain by adding distilled water when needed. Some store are now carrying fully sealed batteries that I suspect won't last as long because you cannot add water to those.
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