As you probably know, Jayco did not install the Batteries. The selling dealer did. Jayco does not supply towable batteries. Now, AGM Interstate are good batteries. BUT, are you stating that a NO TIME in 4 1/2 years you never let the batteries go completely dead? Letting a AGM battery go dead, it will never return to its full capacity. Also, a LOT of Dealer's and Service Centers are ignorant of the conditions for installing AGM and now Lithium batteries. You need to make sure your RV charging system is capable of charging AGM's or Lithium correctly. Just get the manual for your Converter and it will state if it is correct for AGM's without a modification. Most Converter's are capable of charging AGM's correctly. Doug