Yes, you need to have one regulator and only one regulator in the system. Assuming your grill plugs into your RV, the grill presumably does not have a regulator, so you would need one off the tank.
The other issue would be connecting it. It might be best to get female connector like on your RV and connect it to a regulator and hoseso you can use the same connection as your RV. That would keep you from having to check for leaks every time you changed the hose from RV hose to tank hose.
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2019 2106 DS
2019 Colorado Duramax
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