There are 3 pressures: tank, high, and low. The only pressure that's safe for residential and RV appliances is low pressure typically achieved via two regulators in series at the tank. Feeding high pressure gas into the camper and depending on individual low pressure regulators on each appliance (stove, furnace, water heater, refrigerator) is unnecessary and violates safety codes. You can get high pressure gas to outside appliances though.
The two regulators needed to step down tank pressure to low pressure are typically built into a single unit at the tank but it's possible to fit separate high and low pressure regulators in series and take high pressure gas off the connection between the two regulators. My Coleman popup had such a system with the high pressure gas fed off a tee to an external stove/bbq connection. Note the external use. This stove was specifically designed for high pressure gas and would not work on the low pressure system of my Roo.
The red tagged hose is high pressure off the first regulator to an outside (only) connection. The bottom regulator feeds the interior gas appliances,
-- Chuck
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