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Originally Posted by AmcFlorida
I think the dates are stamped in the metal.
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Yes, the dates I have seen are stamped in the metal of the collar on the top of the tank, as Tim noted above. ISTR that in some cases, paper stickers are applied instead of stamping, but I don't know any details. The big hit comes if the tanks are so old that they don't have the required overfill protection device (OPD) valve. I think the ones in your picture are OK, since they have the triangular knobs that signify OPD
Even if the tanks need to be re-certified, you don't have to do it before you go to Florida. Certification is checked when the tanks are filled, so you can put it off until your next fill.
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And how much does it cost. I searched and it seemed to be about $75 per tank.
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I don't think it is anywhere near $75 per tank. But depending on the recert method, you may have to pay for a new fill of propane.
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Why do some folks use two 6 volt batteries?
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That is another whole discussion in itself. Let's put it off until you own the trailer.
Bill