BBQ
Low pressure propane fittings are common on RVs and you may need to remove the BBQ regulator as the use of 2 regulators may give inconsistent propane pressure.
This is my high pressure adapter with a El (for hose routing considerations) and a shutoff valve. The top external tank port came with the adapter. The BBQ connector is the standard 1lb 1" screw on propane bottle type.
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Hoses with the standard 1” screw on adapters are available. And an adapter for the standard BBQ regulator fitting are available. Propane stores can also make custom length hoses however I use 1 or 2 12' hoses as needed.
Here are the parts that connect to any grill.