I take it you are asking about the flexible rubber type hoses. You can use those but you will need to inspect them at least once a year. Some break down quickly, others don’t. You can also have custom ones built by your local propane gas dealer. They don’t cost much and the hoses that Bearman Propane in Chattanooga used was much better material than the “store” bought one I had on our pop-up. And they still looked new 8 years later when we sold the pop-up.