Hi Chuck
The "pipe" on the side of the camper is low pressure, in the 0.5psi range.
Many of the grills or 2 burner stoves are high pressure. Meaning the little green bottle has a regulator on it to take tank pressure down to either 7.5 or 5 psi. It depends on the stove.
If you try it direct to the low pressure pipe and it is a high pressure stove you won't get much heat. And if you hook from the low pressure pipe to the regulator where the little green bottle hooks too odds are high it may not be enough to open the spring in the regulator.
I'm not saying every grill or stove is this way, you need to know if the grill is a high pressure or low pressure grill. If it is made for the little green bottles, odds are it is a high pressure stove designed to be used outdoors.
The stove, oven, HW heater, furnace and fridge are made to run on low pressure inside your camper and that feeder pipe is regulated down to low pressure, 11" of water column (WC.)except the stove that is even further regulated to 10" WC. It's a safety requirement and you have a 2 stage tank regulator to get it that low.
Some of the real big cast iron burner stoves like a Camp Chef are made to run on high or low pressure. On high pressure you can get 35,000 btu burners and on low pressure maybe 1/2 that.
I have heard something about the Weber Q series but do not know for sure if they can be converted to low pressure. Have to research that some more.
Hope this helps
John