lm willing to bet that if the crank handle is on a roof vent that he could figure it out, if he cant figure that out then there is no helping him.
My first guess is that the crank handle is for a TV antenna. Those are often round knobs, but yours could be a drank. Did RVs still come with TV antennas in 2014??? The reason to crank if some is to just keep the moving parts moving so they do not seize up if it is a TV ant.