There are many YouTube videos on how to desulfate batteries, choose a method for the equipment you have.
Since the RV was in your son's driveway, doesn't he have electricity? Why not plug the RV into an extension cord and maintain the batteries. You don't need a 50 or 30 amp service, you can use adaptors and plug the shore cord into a 15 amp outlet. Just don't try to run the air conditioner or other high amp appliances, the on board converter/charger will work fine. Just make sure when plugged into shore power you charge chassis and house batteries. (Measure voltage on and off power, look for a jump in voltage when charging.)
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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