Is your inverter on? Is your USE/STORE switch in STORE? Even with the switch in STORE and the inverter off you will still have some parasitic loads but if your batteries are good (which may not be the case after sitting on the dealers lot) you should stay above 12.0 volts for a week. At 11.5 volts your batteries are over-discharged and damage is occurring until you get them charged.
Charge them, test them, then worry about adding more.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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