It's not a "brand" issue, it's a propane regulation issue.
The quick connect is connected to the coach's regulated propane distribution system so anything you plug into that disconnect can not have its own regulator. Most portable grills are sold to connect to directly either the 20# style bottles, or the small 1 lb bottles, both of which supply unregulated propane to the grill.
You can use one of these grills if you can find a regulator removal kit that will work with it. There's several of them on Amazon.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad