What kind of controller.. A simple valve.
You may find that the Motor Home manufacturer has a specific Grill they sell to mate with that port.. Which Is why I do not like low pressure ports.. I prefer high pressure ports.. (Stay-a-while on a MH, extend-a-flow on a trailer) because those you can choose your grill from a long, long, long list of grills that take throw away bottles or even tanks.
That said, Some grills can be easily modified to work with that kind of hook up.. The Coleman Road Trip for example, though I would not recommend it (Not enough heat). still the mod would be easy.