Assuming the connection you have is a direct connection to the tank and not connected after some kind of a pressure regulator you will just need the proper hose connection that has the existing tank connection as one end and a connection that fits your grill just as if you had connected a gas bottle. You need the grill regulator and temp control to work so you don't want to make any modifications to that setup.

NorCal Dan wrote:

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FOSJ wrote:

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 I kind'a like the idea of utilizing the 100 gal LP tank of the motorhome to supply the grill.

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Where did Monaco hide that huge tank?

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 Betcha it is an 100 LB tank, not gallon.  However, in the original post, a mention was made about a remote fill line.  I am unaware of any approved method for filling a propane tank, let alone that any fill facility would hook up to any sort of connection other than the fill connection on the tank itself.  Federal regulations mandate the fill connection into an auto-shutoff at 80 percent, with significant excessive flow and reverse flow shutoff devices.  Propane fill locations are very, very leery of breaking the law.  A portable tank more than 13 years old, they will not fill.  And, they check.

I suspect the mentioned line is a low pressure connection meant for grill use.  Most often, the regulator on the grill is removed to allow use.  A member on another forum has repiped his propane tank to provide high pressure to the factory installed line.