The
Camp Chef Ranger II takes low-pressure propane directly into the fitting on the side of the stove, after removing the stock hose (which has a regulator on the end) and screwing on a hose with a common 3/8" female flare fitting.
Camp Chef even sells a suitable hose, although it is not necessary to use that one:
RV connection hose
This is a thread in this forum about this stove:
Camp Chef Ranger II Two-Burner Stove
The attached image, from the Camp Chef web page, shows how the hose attaches to the Ranger II (shown upside down).