gas hook up for big red on Grand Design gas port

Thanks to Lakeland Bob for answering my question. I will follow your lead and try to figure it out.

To others, I apologize for not being clear with my question. Big Red in a gas fire pit not a grill, although from Lakeland Bob's comment it has a similar problem with hooking to the gas port. I use a grill with the small bottles and it works fine. Just wanted to eliminate hauling the extra cylinder for my fire pit if possible.

I have successfully adapted a grill and a firepit to run off our onboard Propane outlet.

You will not be able to attach your Big Red as it is currently configured. The hose that is attached to the pit has the control valve and regulator (in one unit) attached where it connects to the propane tank. This unit reduces the tanks's high pressure gas to low pressure for the pit's operation and also controls the volume of gas to the pit for a larger/smaller flame.

What you can do is remove the hose from the pit, attach a short jumper hose to it, install a control valve (since the pit does not have one built in),and then attach a long hose with the required quick connect on one end to the trailer.

I found this control valve

https://www.amazon.com/Precision-Liquid-Propane-Needle-Female/dp/B01D6L8RF4/ref=sr_1_10?ie=UTF8&qid=1544651193&sr=8-10&keywords=propane+gas+control+valve+and+hose

and also this one

https://www.amazon.com/dp/B0024E62CU/?coliid=I2NP2ZJORWSII6&colid=2WNLJF7KRJK7B&psc=0&ref_=lv_ov_lig_dp_it

While on Amazon you can shop for the hoses you want.

FYI, I have 30' that I run between my grill and the RV, and the pit as well.

Keep the hose you remove for those times you want to hook up to a tank.

All I can say is, "Good luck." That hook up does't play nice. I've been trying to get a Coleman camp stove hooked up to the same gas port. I was able to finally fabricate a line that had both end connections to match. I purchased the Coleman regulator separate and cut the regulator part off and used the connection to the stove. I then cut the rubber hose that had the connection for the trailer.

End result? didn't work. The pressure regulator on the camper didn't match the required pressure on the camp stove and the flame blew out at the slightest puff of wind. The camper produced pressure too low for the stove. So, I'm back to using the 1 pound propane bottles from WalMart.

Meanwhile, about the only way to run off the propane tank on your camper is to put a T at the tank and before the regulator so the regulator that came with your grill will still work.

The regulator at your propane tank in your camper is a very low pressure. Chances are, even if you get the connection, the grill still won't work. And definitely, if you are using the regulator that came with the grill and the regulator with the camper, I promise you, it won't work.

I'm still frustrated, but using the 1 pound bottles until this Summer rolls around and I can mess with it again.

You also need to know where the gas port is tapped off your RV system. If it is before the regulator, then you just need a different hose with the correct fitting. If it is tapped off after the RV regulator, then you need to remove the regulator from the grill. My gas port is after the regulator, so I have 2 hoses for my Weber Q. One with a regulator on the end to hook to 20# tanks, and one with no regulator that plugs int gas port. The regulator that was originally installed inside the grill has been removed.

Have no idea what a big red is but if the grill is made to use the small one pound bottles that screw on the grills regulator, then the gas port hook up will not work. The supply line on the trailer is only 10” wc pressure which would not pass through the grills regulator. Every grill I’ve seen hooked up to RV supply had no regulator.