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Hi @crangerwalker ,
Unfortunately the answer is no to all three of your questions.
The E23 will have an aluminum frame, as it stands the other models (E17A/B, 19, 21C/NE, and 5.0) all have steel frames with no options for aluminum.
We have the standard Propane Hot water tank and theoption for a Propane/120V Hot water tank, no option for a 12V Hot water tank.
No options for larger propane tanks.